Phys 26 Flashcards

A patient with impaired renal function accumulates urea and an administered drug metabolite. Which kidney function best explains why this occurs?

A) Erythrocyte destruction regulation

B) Waste and foreign chemical excretion

C) Pulmonary acid buffering

D) Intracellular protein synthesis

Which set includes major renal homeostatic functions rather than primarily hepatic or pulmonary functions?

A) Bile storage; surfactant secretion

B) Platelet activation; bile synthesis

C) Insulin release; bile metabolism

D) Osmolality control; acid-base regulation

A patient with chronic kidney disease develops anemia, hypertension, and fluid overload. Which renal functions are impaired in this pattern?

A) EPO secretion; pressure regulation

B) Bile production; glucose storage

C) Surfactant synthesis; sodium excretion

D) Platelet production; acid excretion

Which paired kidney functions help maintain body fluid composition most directly?

A) Renin breakdown; bile concentration

B) Platelet regulation; protein digestion

C) Water balance; electrolyte balance

D) CO2 excretion; surfactant production

For long-term homeostasis, renal excretion of water and electrolytes must precisely match which variable?

A) Plasma oncotic pressure

B) Daily intake

C) Hematocrit

D) Capillary permeability

A patient suddenly increases dietary sodium intake. Which renal response is required to reestablish sodium balance?

A) Lower sodium excretion below intake

B) Stop sodium filtration immediately

C) Increase sodium excretion to intake

D) Shift sodium into red cells

During the first 2 to 3 days after increased sodium intake, why does extracellular fluid volume rise slightly?

A) Sodium transiently accumulates modestly

B) Plasma proteins enter cells rapidly

C) Renin immediately stops filtration

D) Sodium exits through sweat only

A person adapts to high sodium intake over several days. Which response signals the kidneys to increase sodium excretion?

A) Reduced extracellular fluid volume

B) Increased erythropoietin release

C) Hormonal and compensatory changes

D) Decreased plasma sodium filtration

A patient’s sodium intake increases to more than 10 times normal, yet plasma sodium changes only slightly. Which renal ability best explains this?

A) Fixed sodium excretion

D) Variable sodium excretion

C) Complete sodium storage

D) Absent water regulation

The kidneys play a dominant role in long-term arterial pressure regulation by varying excretion of which substances?

A) Sodium and water

B) Protein and glucose

C) Calcium and albumin

D) Hydrogen and bicarbonate

A patient has chronic salt-sensitive hypertension. Which renal mechanism most directly contributes to long-term arterial pressure regulation?

A) Erythropoietin release

B) Calcitriol production

C) Sodium-water excretion

D) Drug metabolism

The kidneys contribute to short-term arterial pressure regulation by secreting renin, which promotes formation of which vasoactive product?

A) Aldosterone

B) Angiotensin II

C) Erythropoietin

D) Calcitriol

Which pairing best distinguishes renal long-term versus short-term arterial pressure control?

A) Sodium-water excretion; vasoactive hormones

B) EPO secretion; calcitriol activation

C) Acid excretion; glucose synthesis

D) Osmolality control; drug metabolism

A patient with renal failure develops metabolic acidosis. Which renal function is most directly impaired?

A) Oxygen diffusion regulation

B) Platelet activation regulation

C) Acid-base regulation

D) Surfactant metabolism

The kidneys contribute to acid-base homeostasis along with which other systems?

A) Lungs and body fluid buffers

B) Liver and pancreatic enzymes

C) Bone marrow and spleen

D) Skin and lymphatics

Which renal action directly supports acid-base regulation?

A) Secreting bile salts

B) Excreting acids

C) Producing hemoglobin

D) Absorbing oxygen

How do the kidneys help maintain body fluid buffer stores?

A) By regulating buffer stores

B) By destroying bicarbonate

C) By producing plasma albumin

D) By secreting surfactant

A patient with chronic kidney disease develops normocytic anemia. Loss of which renal hormone best explains this finding

A) Angiotensin II

B) Calcitriol

C) Aldosterone

D) Erythropoietin

Erythropoietin secreted by the kidneys primarily acts on which target tissue?

A) Hepatic sinusoidal cells

B) Bone marrow stem cells

C) Pancreatic beta cells

D) Renal collecting ducts

Which sequence best describes the renal role in erythrocyte production?

A) Kidney secretes EPO; marrow produces RBCs

B) Kidney secretes renin; liver makes RBCs

C) Kidney activates vitamin D; spleen makes RBCs

D) Kidney excretes acid; plasma makes RBCs

A patient with renal failure develops impaired calcium and phosphate regulation because active vitamin D production falls. Which renal reaction is deficient?

A) 25-hydroxylation in liver

B) Number 24 hydroxylation

C) Number 1 hydroxylation

D) Intestinal vitamin D absorption

Which active vitamin D form is produced by the kidneys?

A) Cholecalciferol

B) 25-hydroxyvitamin D

C) 1,25-dihydroxyvitamin D3

D) 7-dehydrocholesterol

A nephron cell hydroxylates vitamin D at the number 1 position. What product is formed?

A) Calcitriol

B) Erythropoietin

C) Renin

D) Aldosterone

A patient with advanced kidney disease develops impaired intestinal calcium absorption and abnormal bone mineralization. Loss of which renal product best explains both findings?

A) Renin

B) Calcitriol

C) Erythropoietin

D) Angiotensin II

Which pairing best describes the physiologic importance of calcitriol produced by the kidneys?

A) Sodium wasting; potassium secretion

B) RBC production; acid excretion

C) Bone calcium deposition; GI calcium reabsorption

D) Glucose storage; urea synthesis

A patient fasts for several days. Besides the liver, which renal metabolic process helps maintain blood glucose?

A) Glycogenolysis from renal glycogen

B) Gluconeogenesis from amino acids

C) Ketogenesis from filtered albumin

D) Glycolysis from urinary glucose

During prolonged fasting, the kidneys synthesize glucose from amino acids and other precursors. What is this process called

A) Gluconeogenesis

B) Glycogenesis

C) Glycogenolysis

D) Lipogenesis

A patient with acute renal failure rapidly develops abnormal body fluid volumes and electrolyte composition. Which broad renal role has been disrupted?

A) Pulmonary gas exchange

B) Homeostatic regulation

C) Hepatic bile secretion

D) Splenic blood filtration

A trauma surgeon enters the peritoneal cavity and notes the kidneys are not intraperitoneal organs. Where are the kidneys normally located?

A) Anterior intraperitoneal abdomen

B) Posterior abdominal wall

C) Pelvic peritoneal cavity

D) Thoracic posterior mediastinum

Which description best matches the normal gross size of each adult human kidney?

A) 50 g; thumb-sized

B) 150 g; clenched-fist-sized

C) 300 g; palm-sized

D) 500 g; liver-lobe-sized

A renal artery, renal vein, lymphatics, nerves, and ureter enter or exit through an indented medial kidney region. What is this region called?

A) Papilla

B) Calyx

C) Hilum

D) Pyramid

Which set contains structures that pass through the renal hilum?

A) Artery, vein, ureter, nerves

B) Cortex, capsule, papilla, pelvis

C) Glomerulus, tubule, collecting duct

D) Pyramid, calyx, nephron, capsule

A stone obstructs the tube carrying final urine from the kidney to the bladder. Which structure is obstructed?

A) Renal vein

B) Ureter

C) Minor calyx

D) Efferent arteriole

The bladder stores final urine until which event occurs?

A) Glomerular filtration

B) Bladder emptying

C) Peritubular reabsorption

D) Renal hydroxylation

Which structure surrounds the kidney and protects its delicate inner structures?

A) Fibrous capsule

B) Renal pelvis

C) Peritoneal sac

D) Glomerular membrane

The renal medulla is organized into cone-shaped masses of tissue. Which name and number best match these structures?

A) Calyces; 2 to 3

B) Pyramids; 8 to 10

C) Papillae; 20 to 30

D) Glomeruli; 1 to 2

A renal pyramid extends from the corticomedullary border toward the collecting space. Where does its tip terminate?

A) Hilum

B) Capsule

C) Papilla

D) Arcuate artery

The papilla of a renal pyramid projects into which funnel-shaped collecting space continuous with the ureter?

A) Renal pelvis

B) Renal capsule

C) Renal cortex

D) Renal vein

Which pairing best describes the base and tip of a renal pyramid?

A) Base at pelvis; tip at cortex

B) Base at capsule; tip at hilum

C) Base at hilum; tip at capsule

D) Base corticomedullary; tip papilla

The renal pelvis divides into open-ended pouches that further divide to collect urine from papillae. Which sequence is correct?

A) Minor calyces → major calyces

B) Major calyces → minor calyces

C) Papillae → pyramids → cortex

D) Ureter → capsule → papilla

Which structure directly collects urine from the tubules of each renal papilla?

A) Minor calyx

B) Major calyx

C) Renal artery

D) Renal capsule

A renal artery enters the hilum and branches toward glomerular capillaries. Which arterial sequence is correct?

A) Interlobar → arcuate → interlobular → afferent

B) Arcuate → interlobar → afferent → interlobular

C) Interlobular → arcuate → interlobar → afferent

D) Afferent → interlobular → arcuate → interlobar

Which renal vessel directly leads into the glomerular capillary network?

A) Efferent arteriole

B) Interlobar artery

C) Afferent arteriole

D) Peritubular capillary

A patient’s urine formation begins when fluid and most solutes leave plasma into Bowman space. Which capillary bed performs this filtration?

A) Peritubular capillaries

B) Glomerular capillaries

C) Vasa recta only

D) Cortical venules

During glomerular filtration, which plasma component is normally largely excluded from the filtrate?

A) Sodium

B) Glucose

C) Water

D) Plasma proteins

The distal ends of glomerular capillaries coalesce to form which vessel?

A) Afferent arteriole

B) Efferent arteriole

C) Interlobular artery

D) Arcuate vein

The efferent arteriole leaving the glomerulus leads to which second capillary network?

A) Peritubular capillaries

B) Pulmonary capillaries

C) Portal sinusoids

D) Splenic sinusoids

Peritubular capillaries are positioned to exchange substances with which renal structure?

A) Renal capsule

B) Renal tubules

C) Renal pelvis

D) Renal papilla

What makes the renal circulation unusual compared with most systemic circulations?

A) Two capillary beds in series

B) No arterioles before capillaries

C) Venous blood enters glomeruli

D) Plasma proteins are freely filtered

Which two capillary beds are arranged in series in the renal circulation?

A) Portal; sinusoidal capillaries

B) Pulmonary; bronchial capillaries

C) Glomerular; peritubular capillaries

D) Splenic; hepatic capillaries

In the renal circulation, what vessel separates the glomerular and peritubular capillary beds?

A) Afferent arteriole

B) Efferent arteriole

C) Interlobar artery

D) Arcuate vein

By sitting between two capillary beds, the efferent arteriole helps regulate what variable in both capillary networks?

A) Hydrostatic pressure

B) Plasma glucose

C) Red cell production

D) Urine pH

A renal capillary bed has hydrostatic pressure near 60 mm Hg and supports rapid filtration. Which capillary bed is being described?

A) Peritubular capillaries

B) Glomerular capillaries

C) Vasa recta

D) Cortical veins

A capillary network surrounding renal tubules has hydrostatic pressure near 13 mm Hg. What process does this low pressure favor?

A) Rapid fluid filtration

B) Rapid fluid reabsorption

C) Plasma protein excretion

D) Glomerular capsule filling

Which paired capillary pressure values best match normal renal circulation? A) Glomerular 60; peritubular 13 B) Glomerular 13; peritubular 60 C) Glomerular 25; peritubular 25 D) Glomerular 110; peritubular 60

Which statement best describes the functional capacity of each nephron?

A) Each can form urine

B) Each stores final urine

C) Each secretes erythropoietin

D) Each drains multiple kidneys

After renal injury destroys nephrons, which statement best describes nephron replacement?

A) Nephrons regenerate rapidly

B) Nephrons regenerate slowly

C) Nephrons cannot regenerate

D) Nephrons double after injury

Which pair correctly identifies the two major structural components of each nephron?

A) Glomerulus and long tubule

B) Pyramid and renal pelvis

C) Ureter and collecting duct

D) Calyx and renal capsule

A nephron filters large amounts of fluid from blood through a tuft of capillaries. What is this capillary tuft called?

A) Macula densa

B) Glomerulus

C) Vasa recta

D) Papilla

After fluid is filtered at the glomerulus, what nephron structure modifies it into urine as it travels toward the renal pelvis?

A) Long tubule

B) Renal artery

C) Fibrous capsule

D) Cortical vein

The glomerular capillaries are covered by epithelial cells and enclosed within which structure?

A) Renal pelvis

B) Bowman’s capsule

C) Minor calyx

D) Cortical duct

Which sequence best describes early filtrate flow after glomerular filtration?

A) Bowman’s capsule → proximal tubule

B) Proximal tubule → Bowman’s capsule

C) Distal tubule → Bowman’s capsule

D) Collecting duct → proximal tubule

The proximal tubule lies primarily in which kidney region?

A) Renal medulla

B) Renal pelvis

C) Renal cortex

D) Renal papilla

After leaving Bowman’s capsule, filtrate first enters which nephron segment?

A) Distal tubule

B) Proximal tubule

C) Collecting duct

D) Loop of Henle

From the proximal tubule, filtrate enters a segment that dips into the renal medulla. Which structure is this?

A) Loop of Henle

B) Distal tubule

C) Cortical duct

D) Macula densa

Which paired limbs make up the loop of Henle?

A) Medial and lateral

B) Proximal and distal

C) Descending and ascending

D) Cortical and medullary

A nephron segment descends into the medulla and then ascends back toward the cortex. Which segment is being described?

A) Proximal tubule

B) Loop of Henle

C) Collecting duct

D) Bowman’s capsule

A plaque of specialized epithelial cells sits in the wall near the end of the thick ascending limb. What is it called?

A) Macula densa

B) Renal papilla

C) Bowman capsule

D) Vasa recta

Where is the macula densa located within the nephron?

A) Start of proximal tubule

B) End of thick ascending limb

C) Base of collecting duct

D) Tip of renal papilla

After filtrate passes the macula densa, which segment does it enter next?

A) Proximal tubule

B) Distal tubule

C) Descending limb

D) Bowman’s capsule

Like the proximal tubule, the distal tubule is located in which kidney region?

A) Cortex

B) Medulla

C) Pelvis

D) Papilla

Which sequence best follows the distal tubule?

A) Proximal tubule → loop

B) Connecting tubule → cortical collecting tubule

C) Papilla → minor calyx

D) Bowman’s capsule → glomerulus

The connecting tubule and cortical collecting tubule ultimately lead into which structure?

A) Cortical collecting duct

B) Proximal convoluted tubule

C) Afferent arteriole

D) Renal pelvis

For cortical nephrons, the tubular system is surrounded by what capillary network?

A) Glomerular capillaries

B) Peritubular capillaries

C) Pulmonary capillaries

D) Portal capillaries

Which medullary capillary network is essential for forming concentrated urine?

A) Peritubular plexus

B) Glomerular tuft

C) Vasa recta

D) Arcuate veins

The vasa recta return toward the cortex and empty into which vessels?

A) Cortical veins

B) Renal pelvis

C) Afferent arterioles

D) Major calyces

What term describes the process by which the urinary bladder empties when filled?

A) Filtration

B) Micturition

C) Reabsorption

D) Secretion

Which definition best matches micturition?

A) Kidney filters plasma

B) Bladder empties urine

C) Tubule reabsorbs sodium

D) Ureter transports filtrate

During bladder filling, what rising variable triggers the reflex pathway for urination?

A) Wall tension

B) Plasma osmolarity

C) Renal blood flow

D) Glomerular pressure

Which sequence best describes the two main steps of micturition?

A) Filtration then reabsorption

B) Bladder tension then reflex

C) Renin release then thirst

D) Sodium loss then osmosis

If the micturition reflex fails to empty the bladder, what does it at least usually cause?

A) Complete renal shutdown

B) Conscious desire to urinate

C) Loss of glomerular filtration

D) Increased nephron regeneration

A patient’s bladder is described as having a major urine-collecting region and a funnel-shaped outlet that continues into the urethra. Which pairing correctly identifies these two bladder parts?

A) Trigone; papilla

B) Body; neck

C) Fundus; calyx

D) Cortex; pelvis

The major portion of the urinary bladder where urine accumulates before voiding is called the:

A) Neck

B) Trigone

C) Body

D) Urethra

The bladder neck is best described as which structure?

A) Funnel-shaped urethral extension

B) Smooth triangular mucosal area

C) Major urine storage chamber

D) Skeletal sphincter ring

The bladder neck passes inferiorly and anteriorly into which region before connecting with the urethra?

A) Renal pelvis

B) Peritoneal cavity

C) Sacral canal

D) Urogenital triangle

A physician explains that bladder emptying depends mainly on contraction of the bladder’s smooth muscle coat. What is this muscle called?

A) External sphincter

B) Detrusor muscle

C) Cremaster muscle

D) Levator ani

A cystoscopic exam identifies a small triangular region on the posterior bladder wall immediately above the bladder neck. What is this region?

A) Ureteric papilla

B) Bladder body

C) Bladder trigone

D) External sphincter

Which mucosal feature distinguishes the trigone from most of the bladder lining?

A) Folded rugae

B) Smooth mucosa

C) Ciliated epithelium

D) Keratinized surface

Most bladder mucosa differs from trigone mucosa because it forms which structure?

A) Rugae

B) Papillae

C) Pyramids

D) Calyces

The posterior urethra corresponds anatomically to which bladder region?

A) Bladder body

B) Bladder neck

C) Bladder trigone

D) Urogenital diaphragm

Which tissue combination best describes the wall of the bladder neck?

A) Skeletal muscle; cartilage

B) Detrusor muscle; elastic tissue

C) Mucosa only; smooth rugae

D) Fibrous capsule; renal pelvis

After passing beyond the posterior urethra, the urethra traverses which muscular structure?

A) Urogenital diaphragm

B) Renal hilum

C) Pelvic brim

D) Bladder trigone

The urogenital diaphragm contains which bladder-associated sphincter?

A) Internal urethral sphincter

B) External bladder sphincter

C) Detrusor sphincter

D) Trigonal sphincter

A patient voluntarily stops urination midstream. Which muscle type permits this control?

A) Smooth detrusor muscle

B) Visceral smooth muscle

C) Voluntary skeletal muscle

D) Involuntary cardiac muscle

Which structure is voluntary skeletal muscle rather than smooth muscle?

A) Bladder body

B) Bladder neck

C) External sphincter

D) Detrusor muscle

Which pairing correctly contrasts bladder wall muscle with the external sphincter?

A) Smooth; skeletal

B) Skeletal; smooth

C) Cardiac; skeletal

D) Smooth; cardiac

The principal nerve supply to the urinary bladder travels through which nerves?

A) Hypogastric nerves

B) Pelvic nerves

C) Pudendal nerves

D) Femoral nerves

The pelvic nerves supplying the bladder connect with the spinal cord mainly through which plexus?

A) Lumbar plexus

B) Sacral plexus

C) Cervical plexus

D) Celiac plexus

The main sacral spinal cord segments associated with pelvic nerve supply to the bladder are:

A) S1 and S2

B) S2 and S3

C) S3 and S4

D) S4 and S5

Which fiber types course through the pelvic nerves supplying the bladder?

A) Sensory and motor fibers

B) Motor fibers and sympathetic fibers

C) Sensory fibers and sympathetic fibers

D) Sympathetic fibers and parasympathetic fibers

The motor fibers carried in the pelvic nerves to the bladder are primarily:

A) Somatic fibers

B) Sympathetic fibers

C) Parasympathetic fibers

D) Visceral sensory fibers

A spinal lesion interrupts the parasympathetic motor supply carried to the bladder. Which nerve pathway is most directly affected?

A) Hypogastric nerves

B) Pelvic nerves

C) Lumbar sympathetic chain

D) Pudendal nerves

The bladder receives sympathetic innervation from the sympathetic chain primarily through which nerves?

A) Pelvic nerves

B) Hypogastric nerves

C) Pudendal nerves

D) Obturator nerves

Sympathetic innervation to the bladder connects mainly with which spinal cord segment?

A) T10

B) T12

C) L2

D) S3

Which pairing best matches bladder autonomic pathways with their main spinal levels?

A) Pelvic S2-S3; hypogastric L2

B) Pelvic L2; hypogastric S2-S3

C) Pudendal T10; pelvic L2

D) Hypogastric S3; pudendal L2

Peristaltic contractions in the ureter are enhanced by which autonomic input?

A) Sympathetic stimulation

B) Parasympathetic stimulation

C) Somatic motor stimulation

D) Visceral sensory inhibition

Peristaltic contractions in the ureter are inhibited by which autonomic input?

A) Parasympathetic stimulation

B) Somatic motor stimulation

C) Sympathetic stimulation

D) Pelvic sensory stimulation

The ureters enter the bladder through the detrusor muscle in which bladder region?

A) Bladder dome

B) Bladder neck

C) Bladder trigone

D) Urogenital diaphragm

A child has urine propelled backward from the bladder into the ureter during voiding. What is this condition called?

A) Hydronephrosis

B) Vesicoureteral reflux

C) Nephrotic reflux

D) Urethrovesical obstruction

Severe vesicoureteral reflux can directly cause which anatomic change?

A) Ureteral enlargement

B) Bladder neck shortening

C) Trigone disappearance

D) External sphincter paralysis

Severe vesicoureteral reflux can damage the kidney by increasing pressure in which structures?

A) Glomeruli and cortex

B) Renal calyces and medulla

C) Ureter and bladder body

D) Pelvic nerves and sphincter

A patient with an obstructing ureteral stone has severe ureteral pain and decreased urine output from the affected kidney. Which reflex best explains this response?

A) Micturition reflex

B) Ureterorenal reflex

C) Baroreceptor reflex

D) Tubuloglomerular reflex

In the ureterorenal reflex, pain impulses trigger sympathetic activity that causes which renal vascular change?

A) Renal arteriole constriction

B) Renal vein dilation

C) Glomerular capillary rupture

D) Peritubular capillary dilation

A patient has a blocked ureter. Why does the ureterorenal reflex decrease urine output from that kidney?

A) To increase bladder pressure

B) To stimulate ureteral peristalsis

C) To prevent excess pelvic flow

D) To inhibit renal pain fibers

As the bladder progressively fills, what begins to appear on the bladder pressure curve?

A) Efferent arteriolar pulses

B) Superimposed micturition contractions

C) Portal pressure waves

D) Renal pelvic filtrations

A bladder begins contracting, which activates stretch receptors and increases sensory input from the bladder and posterior urethra. What kind of reflex pattern is this?

A) Self-regenerative reflex

B) Completely voluntary reflex

C) Purely sympathetic reflex

D) Renal autoregulatory reflex

Which sequence best captures the self-regenerative micturition reflex?

A) Contraction; stretch; more contraction

B) Relaxation; stretch; less contraction

C) Pain; arteriole constriction; oliguria

D) Cortex; sphincter contraction; storage

During a self-regenerative micturition reflex, initial bladder contraction increases sensory impulses mainly from which structures?

A) Cortex and pons

B) Kidney and ureter

C) Bladder and posterior urethra

D) Ureter and renal pelvis

What causes the micturition reflex to amplify once it has started?

A) Falling bladder wall tension

B) Reduced posterior urethral input

C) Increased stretch receptor activation

D) Sympathetic inhibition of detrusor

After the micturition reflex reaches strong contraction, what typically happens after seconds to more than a minute?

A) Reflex fatigues and relaxes

B) Bladder pressure rises indefinitely

C) External sphincter contracts permanently

D) Kidney stops filtering completely

The micturition reflex consists of which pressure sequence?

A) Slow fall; plateau; spike

B) Rapid rise; sustained pressure; return

C) Plateau; rapid fall; rebound

D) Basal tone; filtration; secretion

Which phase follows the rapid pressure increase during one complete micturition reflex cycle?

A) Sustained pressure period

B) Immediate renal constriction

C) Complete sphincter fatigue

D) Cortical inhibition only

If a micturition reflex occurs but fails to empty the bladder, when can another reflex usually occur?

A) Immediately without delay

B) After several days

C) After bladder rupture

D) Minutes to one hour later

After an unsuccessful micturition reflex, why does another reflex not usually occur immediately?

A) Reflex elements remain inhibited

B) Stretch receptors are destroyed

C) Pudendal nerves are severed

D) Urine formation completely stops

Once the micturition reflex becomes sufficiently powerful, it triggers another reflex that acts on which structure?

A) Renal pelvis

B) External sphincter

C) Ureteral papilla

D) Glomerular capillaries

A powerful micturition reflex promotes urination by causing what effect on the external bladder sphincter?

A) It contracts forcefully

B) It becomes inhibited

C) It becomes fibrotic

D) It blocks sensory input

Which nerve carries the reflex signal that inhibits the external sphincter during a strong micturition reflex?

A) Hypogastric nerve

B) Vagus nerve

C) Pudendal nerve

D) Phrenic nerve

The basic micturition reflex is best classified as which type of reflex?

A) Autonomic spinal cord reflex

B) Somatic cortical reflex

C) Endocrine renal reflex

D) Voluntary ureteral reflex

Which statement best describes brain control over the micturition reflex?

A) Brain centers only inhibit it

B) Brain centers only facilitate it

C) Brain centers cannot affect it

D) Brain centers modulate it

Strong facilitative and inhibitory centers for micturition are located mainly in which brain region?

A) Cerebellum

B) Pons

C) Thalamus

D) Medulla

Besides the brainstem, higher control of micturition also involves centers in which region?

A) Cerebral cortex

B) Basal ganglia

C) Spinal dorsal horn

D) Renal medulla

Under normal conditions, what do higher centers do to the micturition reflex during bladder storage?

A) Completely abolish it

B) Partially inhibit it

C) Fully activate it

D) Convert it to pain

How can higher centers prevent urination even when the micturition reflex occurs?

A) Relaxing the external sphincter

B) Contracting the detrusor muscle

C) Tonic external sphincter contraction

D) Increasing ureteral peristalsis

A medical student delays urination despite bladder fullness. Which mechanism allows this voluntary postponement?

A) Tonic external sphincter contraction

B) Renal arteriole dilation

C) Macula densa inhibition

D) Papillary smooth muscle relaxation

When it is time to urinate, cortical centers help initiate voiding by facilitating which centers?

A) Lumbar sympathetic centers

B) Sacral micturition centers

C) Hypothalamic thirst centers

D) Renal autoregulatory centers

During voluntary initiation of urination, cortical centers coordinate which paired actions?

A) Facilitate sacral centers; inhibit sphincter

B) Inhibit sacral centers; contract sphincter

C) Constrict renal arterioles; inhibit bladder

D) Stimulate ureters; close bladder neck

A patient with a blocked ureter has pain-triggered renal arteriole constriction, while a full bladder has stretch-triggered detrusor contraction. Which pairing is correct?

A) Micturition; ureterorenal

B) Ureterorenal; micturition

C) Pudendal; hypogastric

D) Cortical; glomerular

A patient intentionally begins urinating by increasing intra-abdominal pressure. Which initial voluntary action best explains this step?

A) Contracts abdominal muscles

B) Relaxes pelvic stretch receptors

C) Contracts ureteral smooth muscle

D) Inhibits sacral sensory fibers

During voluntary urination, abdominal muscle contraction increases bladder pressure and pushes urine into which structures?

A) Renal pelvis and calyces

B) Bladder neck and posterior urethra

C) Ureter and renal pelvis

D) Trigone and renal cortex

A person voluntarily strains to urinate, causing urine to enter the bladder neck and posterior urethra under pressure. What is the next key trigger?

A) Detrusor ischemia

B) Sodium retention

C) Stretch receptor stimulation

D) Renal arteriole constriction

Stretch of the bladder neck and posterior urethra during voluntary urination produces which paired effect?

A) Reflex excitation; sphincter inhibition

B) Reflex inhibition; sphincter contraction

C) Renal constriction; ureter relaxation

D) Sympathetic activation; detrusor relaxation

A spinal injury destroys sensory fibers from the bladder to the spinal cord. Which consequence is most likely?

A) Continuous forceful detrusor contraction

B) Absent micturition reflex contraction

C) Excessive voluntary sphincter control

D) Increased renal sodium excretion

A patient’s bladder fills to capacity and then leaks a few drops at a time through the urethra. Which diagnosis best matches this pattern?

A) Stress incontinence

B) Overflow incontinence

C) Uninhibited neurogenic bladder

D) Vesicoureteral reflux

Which bladder pattern is expected when the micturition reflex cannot be triggered by bladder stretch input?

A) Periodic complete emptying

B) Frequent controlled micturition

C) Capacity filling with dribbling

D) Rapid ureteral obstruction

A patient develops an atonic bladder after trauma to the sacral spinal cord. Which injury pattern is the classic cause?

A) Cervical hyperextension injury

B) Thoracic disc herniation

C) Crush injury to sacrum

D) Pontine hemorrhagic stroke

A patient with tertiary syphilis develops constrictive fibrosis around dorsal root fibers and abnormal bladder emptying. What is the neurologic condition called?

A) Uninhibited neurogenic bladder

B) Tabes dorsalis

C) Central diabetes insipidus

D) Vesicoureteral reflux

Syphilis causes constrictive fibrosis around dorsal root nerve fibers, destroying them. What bladder condition can result?

A) Tabetic bladder

B) Spastic ureter

C) Hypertonic bladder neck

D) Filarial bladder

Which pairing correctly links syphilitic dorsal root damage with its bladder manifestation?

A) Tabes dorsalis; tabetic bladder

B) Addison disease; overflow bladder

C) Diabetes insipidus; atonic bladder

D) Sacral crush; uninhibited bladder

A patient has frequent, relatively uncontrolled urination after partial spinal cord damage interrupts descending inhibition. Which condition best fits?

A) Overflow incontinence

B) Tabetic bladder

C) Uninhibited neurogenic bladder

D) Vesicoureteral reflux

Which injury pattern can produce uninhibited neurogenic bladder?

A) Partial spinal cord or brainstem damage

B) Complete destruction of bladder sensory fibers

C) Isolated renal cortical necrosis

D) Fibrosis of renal papillae

Which paired pattern best distinguishes overflow incontinence from uninhibited neurogenic bladder?

A) Dribbling overflow; frequent uncontrolled voiding

B) Frequent voiding; absent bladder filling

C) Painful reflux; complete urinary retention

D) Normal reflex; absent sphincter inhibition

Which equation correctly describes urinary excretion rate?

A) Filtration + reabsorption − secretion

B) Filtration − reabsorption + secretion

C) Reabsorption − filtration + secretion

D) Secretion − filtration − reabsorption

Which set contains metabolic waste products that are poorly reabsorbed and excreted in large amounts?

A) Sodium, chloride, bicarbonate

B) Albumin, glucose, amino acids

C) Urea, creatinine, uric acid

D) Calcium, phosphate, magnesium

A patient’s kidneys clear end products of metabolism into urine because they are poorly reabsorbed. Which substance best fits this category?

A) Creatinine

B) Bicarbonate

C) Sodium

D) Chloride

Which set contains substances normally highly reabsorbed so only small amounts appear in urine?

A) Urea, creatinine, urates

B) Sodium, chloride, bicarbonate

C) Creatinine, glucose, uric acid

D) Albumin, urates, urea

For most substances handled by the kidney, how do filtration and reabsorption rates compare with excretion rates?

A) Much smaller than excretion

B) Roughly equal to excretion

C) Extremely large relative to excretion

D) Unrelated to excretion