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Chapter 27

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1) Stem cell.
2) First cells with n number of chromosomes.
3) Type B spermatogonia.
4) Early spermatids.
5) Primary spermatocyte.

1. A

2. D

3. B

4. E

5. C

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6) Acrosome.
7) Location of mitochondria.
8) Midpiece.
9) Location of nucleus.
10) Area of compacted DNA.
11) Flagellum.

1. B

2. A

3. A

4. C

5. C

6. D

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12) The stage called ovulation.
13) Vesicular (Graafian) follicle.
14) Primary follicles.
15) Primordial follicle.
16) Corpus luteum.
17) Mature follicle.

12. E

13. C

14. B

15. A

16. D

17. C

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1) The dartos and cremaster muscles are important to the integrity of the male reproductive
system. Which of the following is true about the role they play?
A) They contract to push sperm along the ductus deferens.
B) They regulate the temperature of the testes.
C) They are responsible for penile erection.
D) They contract to allow ejaculation.

B) They regulate the temperature of the testes.

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2) The ability of sperm cells to move along the ductus deferens is due to ________.
A) gravity
B) peristaltic contractions
C) enzymatic activity
D) hormonal action

B) peristaltic contractions

6

3) The ability of a male to ejaculate is due to the action of ________.

D) the bulbospongiosus muscles

7

4) The most important risk for testicular cancer in young males is ________.

C) nondescent of the testes

8

5) Which of the following glands are responsible for 60% of the synthesis of semen?

C) the prostate

9

6) Which of the following hormones controls the release of anterior pituitary
gonadotropins?

C) GnRH

10

7) Development of male reproductive structures depends on which of the following events?

C) secretion of male hormones prenatally and lasting into the first few months after birth

11

8) The primary function of the uterus is to ________.

D) receive, retain, and nourish a fertilized ovum

12

9) Why is the bloodtestis
barrier important?

A) because spermatozoa and developing cells produce surface antigens that are recognized
as foreign by the immune system

13

10) The structures that receive the ovulated oocyte, providing a site for fertilization, are
called the ________.

B) fallopian tubes

14

11) If gametes were diploid like somatic cells, how many chromosomes would the zygote
contain?

A) twice the diploid number, and with every succeeding generation, the chromosome
number would continue to double and normal development could not occur

15

12) Human egg and sperm are similar in that ________.

C) they have the same number of chromosomes

16

13) The constancy of the chromosome number from one cell generation to the next is
maintained through ________.

B) meiosis

17

14) Fertilization generally occurs in the ________.

D) fallopian tubes

18

15) Spermiogenesis involves the ________.

C) formation of a functional sperm by the stripping away of superfluous cytoplasm

19

16) All of the following can be considered male secondary sex characteristics except the
________.

C) development of testes as opposed to ovaries

20

17) In humans, separation of the cells at the twocell
state following fertilization may lead to
the production of twins, which in this case would be ________.

B) identical

21

18) Characteristics of the mature sperm include the ________.

B) presence of Y chromosomes in approximately half the sperm

22

19) How do the testes respond to exposure to excessive body warmth?

B) They move away from the pelvic cavity.

23

20) Effects of estrogen include ________.

C) growth of the breasts at puberty

24

21) Secretion of progesterone stimulates ________.

B) preparation of the mammary glands for lactation

25

22) Which of the following statements about sperm is not true?

B) They are sluggish in an alkaline environment.

26

23) The cells that produce testosterone in the testis are called ________.

D) interstitial cells

27

24) The testicular cells that construct the bloodtestis
barrier are the ________.

C) sustentacular cells

28

25) Which of the following occurs as a result of undescended testes?

C) Inadequate or nonviable sperm will be produced.

29

26) Erection of the penis results from ________.

D) a parasympathetic reflex

30

27) Which is not a part of the proliferative phase of the female menstrual cycle?

C) corpus luteum

31

28) Which of the choices below is not a function of the vagina?

A) serves as a passageway for the primary oocyte

32

29) Select the correct statement about male sexual response.

B) Erection is the result of vascular spaces in the erectile tissues filling with blood.

33

30) Which of the choices below is not a function of testosterone?

D) stimulates mammary gland development

34

31) Which male hormone inhibits the secretion of FSH?

B) inhibin

35

32) During the secretory phase of the menstrual cycle ________.

B) progesterone levels are at their highest

36

33) Select the correct statement about the uterine cycle.

D) If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the
developing embryo.

37

34) Which of the choices below is not a part of the braintesticular
axis?

C) thalamus

38

35) Which of the following statements is true concerning the mammary glands of both males
and females?

D) The mammary glands are modified sweat glands that are actually part of the
integumentary system.

39

36) Normally menstruation occurs when ________.

B) blood levels of estrogen and progesterone decrease

40

37) The basic difference between spermatogenesis and oogenesis is that ________.

C) in oogenesis, one mature ovum is produced, and in spermatogenesis four mature sperm
are produced from the parent cell

41

38) Occasionally three polar bodies are found clinging to the mature ovum. One came from
an unequal division of the ovum, but from where did the other two arise?

C) The first polar body has also divided to produce two polar bodies.

42

39) Which of the following will occur after ovulation?

B) The endometrium enters its secretory phase

43

40) Why doesn’t semen enter the urinary bladder during ejaculation?

C) The smooth muscle sphincter at the base of the urinary bladder closes.

44

41) Spermatogenesis ________.

B) involves a kind of cell division limited to the gametes

45

42) Which hormone is absolutely necessary for ovulation to occur?

A) LH

46

43) The braintesticular
axis ________.

B) involves FSH and LH release

47

44) Select the correct statement about testosterone control.

A) GnRH from the hypothalamus causes FSH and LH release from the anterior pituitary.

48

45) Which of the following is a correct statement about uterine tubes?

B) The infundibulum is the funnelshaped
region near the ovary.

49

46) Select the correct statement about the hormonal events of the ovarian cycle.

B) High estrogen levels result in a surge of LH release.

50

47) Which of these statements about sexually transmitted infections is false?
.

C) Syphilis is caused by a virus that may lead to death if untreated.

51

48) Which of the following statements about spermatogenesis is not true?

D) Each spermatid forms two sperm.

52

49) A boy who has not passed through puberty sustains an injury to his anterior pituitary
such that FSH is no longer released, but LH is normal. After he grows to maturity, one
would expect that he would ________.

A) be sterile

53

50) Which of the following statements about the female reproductive process is not true?

C) Rebuilding the endometrium is under the control of prolactin.

54

51) A low secretion of luteinizing hormone (LH) in the normal male adult would cause
________.

A) decreased testosterone secretion

55

52) All of the following statements referring to the uterine cycle are true except ________.

A) FSH and LH directly promote development of the uterine endometrium

56

3) Which of the following phases or processes in the monthly reproductive cycle of the
female occur simultaneously?

D) regression of the corpus luteum and a decrease in ovarian progesterone secretion

57

54) The duct system of the male reproductive system does not include the ________.

D) corpus spongiosum

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55) An ovulating oocyte is actually activated by hormones about ________ days before
ovulation.

D) 110

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56) Prostate cancer is _______.

B) sometimes a slow growing cancer that may never represent a threat to the patient