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Ch. 25-29 A&P

front 1

What type of fetal testing provides results within a day or so of the test?

back 1

chorionic villus sampling

front 2

At how many weeks of pregnancy can chorionic villus sampling (CVS) be safely performed?

back 2

10 weeks

front 3

At what age are both amniocentesis and chorionic villus sampling routinely ordered when a woman is pregnant to test for Down syndrome?

back 3

35 years old

front 4

Using the information provided in this figure, what is the probability of producing a homozygous dominant offspring?

back 4

25%

front 5

Using the information provided in this figure, what is the probability of producing an offspring who can roll their tongue?

back 5

75%

front 6

Which of the following is NOT the tongue-roller genotype?

back 6

tt

front 7

Using the information provided in this figure, what is the probability of producing an offspring who CANNOT roll his or her tongue?

back 7

25%

front 8

Using the information provided in this figure, what is the genotype of a homozygous recessive offspring?

back 8

tt

front 9

Using the information provided in this figure, what is the probability of producing an offspring whose phenotype is that of tongue-roller?

back 9

75%

front 10

Continuous phenotypic variation between two extremes results from _________.

back 10

polygenic inheritance

front 11

Three genes control skin color. How many possible combinations of skin color result from those three genes?

back 11

64

front 12

Which of the following exemplifies polygenic inheritance?

back 12

height

front 13

How many chromatids are present in a tetrad?

back 13

4

front 14

During what phase of meiosis do the tetrads align together along the metaphase spindle?

back 14

metaphase I

front 15

If a cell has a diploid number of 22, how many total chromosomes should it have?

back 15

22

front 16

When one chromatid segment has formed a chiasma with a homologous chromatid segment, what is the result?

back 16

recombinant chromosomes

front 17

What do chiasmas promote?

back 17

genetic variability

front 18

For a cell with a five homologous pairs, calculate how many different gamete types can result from meiosis.

back 18

32

front 19

During metaphase of meiosis I, the alleles determining each trait are distributed to different gametes. What is this called?

back 19

segregation

front 20

What is the name of the condition when a person has inherited the genotype HH?

back 20

homozygous dominant

front 21

In this figure, hair color genes and eye color genes are located on the same chromosome. Since these genes are transmitted as a unit to daughter cells during mitosis, we describe these genes as ____________.

back 21

linked

front 22

Which statement best describes the function of the urethra?

back 22

The urethra transports urine from the bladder to the outside of the body.

front 23

What region of the male urethra runs through the urogenital diaphragm, extending about 2 cm from the prostate to the beginning of the penis?

back 23

intermediate part of the urethra (membranous urethra)

front 24

What type of epithelial tissue forms the mucosa layer of the urinary bladder?

back 24

transitional epithelium

front 25

Which pressure is the chief force pushing water and solutes out of the blood and across the filtration membrane of the glomerulus?

back 25

hydrostatic pressure in glomerular capillaries (HPgc)

front 26

Which of the following is the volume of filtrate formed each minute by all of the glomeruli of the kidneys?

back 26

glomerular filtration rate (GFR)

front 27

Calculate the net filtration pressure if blood pressure in the glomerulus is unusually high, around 68 mm Hg.

back 27

23 mm Hg

front 28

What hormone promotes active tubular secretion of potassium ions in the late distal convoluted tubule (DCT) and collecting ducts?

back 28

aldosterone

front 29

In what part of the renal tubule are aquaporins scarce or absent so that water CANNOT be reabsorbed?

back 29

ascending limb of the nephron loop

front 30

In what part of the renal tubule does parathyroid hormone (PTH) promote the reabsorption of calcium ions?

back 30

distal convoluted tubule (DCT)

front 31

Which of the following promotes the formation of dilute urine?

back 31

decreased osmolality of extracellular fluids

front 32

Which statement best describes the effect diuretics have?

back 32

Diuretics increase urinary output.

front 33

Where does antidiuretic hormone (ADH) exert its effects to promote water reabsorption?

back 33

collecting duct

front 34

Which region of the kidney is characterized by the presence of cone-shaped pyramids? Select from letters A-D.

back 34

B

front 35

What region subdivides to form two or three major calyces and several minor calyces? Select from letters A-D.

back 35

C

front 36

Which letter represents the most superficial region of the kidney? Select from letters A-D.

back 36

A

front 37

What arteries branch off the arcuate arteries?

back 37

cortical radiate (interlobular) arteries

front 38

Which vessel is present in the arterial pathway as blood flows into the kidney but NOT present in the venous pathway exiting the kidney?

back 38

segmental

front 39

Which vessels supply the cortical tissue of the kidney with blood?

back 39

cortical radiate arteries

front 40

What two structures constitute the renal corpuscle?

back 40

glomerulus and glomerular (Bowman's) capsule

front 41

Which of the three parts of the renal tubule is formed by cuboidal epithelial cells bordered by dense microvilli?

back 41

proximal convoluted tubule

front 42

In which kidney region are all renal corpuscles located?

back 42

renal cortex

front 43

Which of the following is NOT characteristic of the cortical nephrons?

back 43

The glomerulus of the cortical nephron is closer to the cortex-medulla junction.

front 44

Where does the efferent arteriole of the juxtamedullary nephron carry blood to?

back 44

vasa recta

front 45

Which capillary bed produces filtrate?

back 45

glomerulus

front 46

What is the function of the macula densa cells of the juxtaglomerular complex (JGC)?

back 46

The macula densa cells monitor the NaCl content of the filtrate entering the distal convoluted tubule.

front 47

Where is filtrate produced in the nephron?

back 47

glomerulus

front 48

What vessel directly feeds into the glomerulus?

back 48

afferent arteriole

front 49

This chemical equation shows the reaction of a strong acid and weak base in the bicarbonate buffer system. Provide the products of the following reaction. HCl + NaHCO3 -->

back 49

H2CO3 + NaCl

front 50

Which chemical buffer system is the only important system in the extracellular fluid (ECF) that resists short-term changes in pH?

back 50

bicarbonate buffer system

front 51

In order to buffer a strong acid into a weak acid, which has a less dramatic effect on pH, what chemical should be used as the buffer?

back 51

weak base

front 52

Which of the following regulates the secretion of K+ into the filtrate?

back 52

aldosterone

front 53

What is the most important trigger for aldosterone release?

back 53

renin-angiotensin-aldosterone mechanism

front 54

What results from increased levels of aldosterone?

back 54

increased Na+ reabsorption

front 55

In a given day, what is the typical value for water intake?

back 55

2500 ml

front 56

What accounts for the route through which most fluid is lost in a day?

back 56

urine

front 57

How much water is generated per day from cellular metabolism?

back 57

250 ml

front 58

Which of the following is NOT involved in triggering the thirst mechanism?

back 58

increase in blood pressure

front 59

What receptors does the brain use to detect changes in osmolality?

back 59

osmoreceptors

front 60

What hormone helps to maintain extracellular fluid (ECF) osmolality when concentrations become too high?

back 60

antidiuretic hormone (ADH)

front 61

What type of water imbalance increases the amount of fluid in all compartments?

back 61

hypotonic hydration

front 62

Which of the following conditions promotes edema?

back 62

hypoproteinemia

front 63

What is the hallmark of hypotonic hydration?

back 63

hyponatremia

front 64

Where is the majority of water stored in the human body?

back 64

intracellular fluid (ICF) compartment

front 65

Select the person in the following list who would have the highest percentage of water in his or her body.

back 65

a 6-month-old baby boy

front 66

During pregnancy, which hormone is responsible for stimulating maturation of the breast for lactation?

back 66

human placental lactogen (hPL)

front 67

What role does oxytocin play in promoting labor?

back 67

Oxytocin stimulates the uterus to contract.

front 68

Which of the following serves as the trigger to begin the vigorous, rhythmic contractions of true labor?

back 68

prostaglandins

front 69

What is released from fetal lungs in the weeks before delivery to soften the cervix in preparation for labor?

back 69

surfactant protein A (SP-A)

front 70

How long does the expulsion stage typically last in a first birth?

back 70

50 minutes

front 71

During what stage is the afterbirth delivered?

back 71

placental stage

front 72

The softening and thinning of the cervix during the dilation stage is known as ___________.

back 72

effacement

front 73

What does the hormone relaxin promote?

back 73

Relaxin promotes the relaxation, widening, and increased flexibility of the pelvic ligaments and pubic symphysis.

front 74

Due to the increased bulkiness of the anterior abdomen and the change in a pregnant woman's center of gravity, what type of spinal curvature do many pregnant women develop?

back 74

lordosis

front 75

Which fetal vascular shunt directly connects the right atrium to the left atrium so as to bypass the nonfunctional lungs?

back 75

foramen ovale

front 76

Which fetal vascular shunt bypasses the pulmonary circuit by connecting the pulmonary trunk to the aorta?

back 76

ductus arteriosus

front 77

The dermatome is one of the three somites of the mesoderm. What does the dermatome form?

back 77

dermis of the skin in the dorsal part of the body

front 78

From what germ layer is the serosae of the coelom derived?

back 78

mesoderm

front 79

From what germ layer are the somites derived?

back 79

mesoderm

front 80

Which of the following arises from the endoderm?

back 80

mucosal lining of the gastrointestinal tract and respiratory tract

front 81

Which of the following is derived from the somites of the mesoderm?

back 81

vertebrae and ribs

front 82

Which germ layer gives rise to the nervous system?

back 82

ectoderm

front 83

Which of the following takes oxygenated blood to the liver from the placenta?

back 83

umbilical vein

front 84

Which extra-embryonic membrane protects the developing embryo against physical trauma and helps maintain a constant homeostatic temperature?

back 84

amnion

front 85

Which of the following implants in the mucosa of the endometrium?

back 85

blastocyst

front 86

What is the 16-cell stage known as?

back 86

morula

front 87

How much time passes after fertilization until implantation occurs?

back 87

7 days

front 88

Which of the following is the multicellular cytoplasmic mass formed from the trophoblast as it implants into the endometrium?

back 88

syncytiotrophoblast

front 89

What releases human chorionic gonadotropin (hCG)?

back 89

trophoblast

front 90

What membrane does the trophoblast form after implantation?

back 90

chorion

front 91

Together, what do the decidua basalis and the chorionic villi form?

back 91

placenta

front 92

What is the function of the placenta?

back 92

The placenta functions as a nutritive, respiratory, excretory, and endocrine organ for the developing embryo.

front 93

Once sperm are deposited into the vagina, sperm motility must be enhanced and they must be prepared to release hydrolytic enzymes from their acrosomes. What is this process called?

back 93

capacitation

front 94

What does the cortical reaction prevent?

back 94

polyspermy

front 95

What is the event that results when the maternal and paternal chromosomes combine?

back 95

fertilization

front 96

Which of the following cells is released during ovulation?

back 96

secondary oocyte

front 97

Why CAN'T polar bodies be fertilized?

back 97

Polar bodies lack nutrient-containing cytoplasm.

front 98

How many functional gametes are produced by oogenesis?

back 98

one functional gamete

front 99

What event occurs during the proliferative phase?

back 99

ovulation

front 100

During what phase of the female's uterine (menstrual) cycle is the uterine lining shed?

back 100

menstrual phase

front 101

What hormone promotes ovulation?

back 101

luteinizing hormone (LH)

front 102

What part of the female duct system is the usual site of fertilization of the ovulated oocyte?

back 102

uterine (fallopian) tube (oviduct)

front 103

Which layer of the uterine wall is made of smooth muscle?

back 103

myometrium

front 104

Which specific layer of the uterus is shed during menstruation, approximately every 28 days?

back 104

stratum functionalis of the endometrium

front 105

Specifically, what encloses the vestibule which houses the openings of the urethra and vagina?

back 105

labia minora

front 106

Which structure of the female's external genitalia has erectile tissue like the penis?

back 106

clitoris

front 107

What are the two fatty, hair-covered skin folds that run posteriorly from the mons pubis?

back 107

labia majora

front 108

What part of the breast produces milk?

back 108

alveoli

front 109

The mammary glands belong to which of the following systems?

back 109

integumentary system

front 110

What is the pigmented ring of skin situated slightly below the center of each breast?

back 110

areola

front 111

Which of the following inhibits the release of FSH from the anterior pituitary and GnRH from the hypothalamus when the sperm count is high?

back 111

inhibin

front 112

Which of the following keeps the concentration of testosterone in the vicinity of the spermatogenic cells high to stimulate spermatogenesis?

back 112

androgen-binding protein (ABP)

front 113

Which hormone promotes the formation of secondary sex characteristics such as the appearance of pubic, axillary, and facial hair, enhanced hair growth on the chest, and a deepening voice?

back 113

testosterone

front 114

Why does meiosis involve two nuclear divisions rather than one, as in mitosis?

back 114

Meiosis reduces the chromosome number by half.

front 115

At what point during meiosis do homologous chromosomes pair up?

back 115

prophase I

front 116

During meiosis, what does crossover promote?

back 116

Crossover promotes increased genetic variability among gametes.

front 117

Which of the following results from spermiogenesis?

back 117

sperm

front 118

Which of the following is the haploid cell produced as a result of meiosis I?

back 118

secondary spermatocyte

front 119

Which of the following cells is returned to the basal lamina to continue the pool of dividing germ cells?

back 119

type A daughter cell or spermatogonium

front 120

Which of the following is the site where sperm are stored until they are ejaculated?

back 120

tail of the epididymis

front 121

Which cells produce androgens such as testosterone?

back 121

interstitial endocrine (Leydig) cells

front 122

Which of the following is housed within the spermatic cord?

back 122

testicular arteries and veins

front 123

Which portion of the penis is removed through a procedure known as circumcision?

back 123

prepuce (foreskin)

front 124

Which of these male accessory ducts transports both sperm and urine?

back 124

urethra

front 125

During vasectomy, what accessory duct is cut as a form of birth control?

back 125

ductus (vas) deferens