Urinary System 1

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updated 8 years ago by Darlenejmnz
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1

the urinary system helps to maintain both the...

volume and chemical makeup of the blood

2

the passage of substances across an epithelial layer into the blood or lymph

absorption

3

occurs when hydrostatic pressure forces water and small solutes across a membrane

filtration

4

the elimination of wastes from the body

excretion

5

the expulsion of urine from the urinary bladder

micturition

6

passage of a substance from a cell to extracellular
fluid

secretion

7

any substance not useful to the body

waste

8

the condition in which the body's internal environment remains within normal physiological limits

homeostasis

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the water and small solutes that are filtered (pushed through the membrane by hydrostatic pressure)

filtrate

10

nitrogen-containing organic molecules other than
proteins, such as urea, uric acid, and creatinine

nitrogenous wastes

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what types of tissues do the renal layers have

1. renal fascia-dense irregular connective tissue

2. perirenal fat capsule- adipose tissue

3. fibrous capsule- dense irregular connective tissue

12

creatine phosphate equation

creatine phosphate + ADP ---> ATP + creatine

13

renal ptosis

1. rapid weight loss-> 2. fat capsules diminish-> 3. kidney drops to lower position (renal ptosis)-> 4. ureter kinked blocking urine flow-> 5. urine backs up into kidney, increasing hydrostatic pressure there (hydronephrosis)-> 6. renal damage

14

hilum

depression through which blood vessels and nerves enter and leave an organ

15

cortical radiate arteries and veins are also known as...

interlobular arteries and veins

16

a nephron is made up of...

1.renal corpuscle
-glomerulus
-glomerular capsule)

2.renal uubule
-PCT
-DCT
-loop of henle

17

the juxtaglomerular apparatus is located...

where the renal tubule makes contact with the
afferent arteriole

18

the juxtaglomerular apparatus consists of:

1. juxtaglomerular cells
2. macula densa

19

juxtaglomerular cells

-modified smooth muscle cells in the wall of the afferent arteriole that:

a) detect distension of the afferent arteriole when BP increases
b) secrete the enzyme renin

20

macula densa

- cluster of modified epithelial cells lining the renal tubule that are columnar in shape and densely packed.

a) detects flow rate of the tubular fluid
b) secretes a vasoconstrictor chemical.

21

filtration membrane

-selectively permeable membrane through which blood is filtered

-made up by the wall of the glomerular capillary and the wall of the glomerular capsule (visceral portion)

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layers of filtration membrabe

1. capillary endothelium
2. capillary basement membrane
3. capsular basement membrane
4. capsular epithelium (visceral layer of glomerular capsule, composed of podocytes)

23

reabsorption-secretion membrane

made up by the wall of a peritubular capillary and the wall of the renal tubule