reproductive

Select the correct statement about the uterine cycle. a. If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo. b. The menstrual phase of the cycle is normally from day 1 to day 8. c. During the proliferative phase, levels of progesterone rise as the follicle begins to produce more hormone. d. During the secretory phase, estrogen levels are at their highest.

a

The cells that produce testosterone in the testis are called ________. a. interstitial endocrine cells b. sustentacular cells c. spermatogonia d. spermatocytes

a

The constancy of the chromosome number from one cell generation to the next is maintained through ________. a. meiosis b. DNA synthesis c. mitosis d. cytokinesis

a

The duct system of the male reproductive system includes all but which of the following? a. corpus spongiosum b. epididymis c. urethra d. ductus deferens

a

Which is not a part of the proliferative phase of the female menstrual cycle? a. corpus luteum b. vesicular follicle growth c. late in this phase, cervical mucus becomes thin and crystalline d. development of endometrial cells

a

Which of the following statements about the female reproductive process is not true? a. Rebuilding the endometrium is under the control of prolactin. b. Ovulation usually occurs 14 days after the beginning of menses. c. The monthly discharge of the uterus (menses) is initiated by the decrease in secretion of female hormones. d. Fertilization usually occurs in the fallopian tube.

a

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. have impaired function of interstitial cells b. be unable to produce viable sperm c. not develop secondary sex characteristics d. be impotent (unable to have an erection)

b

Which of the following female structures is homologous to the male scrotum? a. labia minora b. labia majora c. clitoris d. vagina

b

Which of the following hormones controls the release of anterior pituitary gonadotropins? a. LH b. GnRH c. testosterone d. FSH

b

Why is the blood-testis barrier important? a. because some blood contents are toxic to the spermatozoa b. because spermatozoa and developing cells produce surface antigens that are recognized as foreign by the immune system c. because the barrier traps sex hormones, keeping them at a higher level than the blood d. because immature sperm cells lose their motility when they encounter any blood component

b

Human egg and sperm are similar in that ________. a. they have the same degree of motility b. they are about the same size c. they have the same number of chromosomes d. about the same number of each is produced per month

c

In humans, separation of the cells at the two-cell state following fertilization may lead to the production of twins, which in this case would be ________. a. of different sexes b. fraternal c. identical d. dizygotic

c

Secretion of progesterone stimulates ________. a. proliferation of the uterine myometrium b. contraction of uterine muscles c. preparation of the mammary glands for lactation d. development of the female secondary sex characteristics

c

The primary function of the uterus is to ________. a. regulate the ovarian and menstrual cycles b. protect the ovaries c. receive, retain, and nourish a fertilized ovum d. synthesize female hormones

c

Which of the choices below is not a part of the hypothalamic-pituitary-gonadal axis? a. interstitial cells b. hypothalamus c. thalamus d. anterior pituitary gland

c

Which of the following glands are responsible for 70% of the synthesis of semen? a. the bulbourethral glands b. the prostate c. the seminal vesicles d. the pituitary

c

The ability of sperm cells to move along the ductus deferens is due to ________. a. gravity b. hormonal action c. enzymatic activity d. peristaltic contractions

d

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 contract to allow ejaculation. c. They are responsible for penile erection. d. They regulate the temperature of the testes.

d

Which male hormone inhibits the secretion of FSH? a. GnRH b. ICSH c. ACTH d. inhibin

d

Which of the choices below is not a function of the vagina? a. serves as the birth canal b. receives semen from the penis during sexual intercourse c. serves as a passageway for menstrual flow d. serves as a passageway for the primary oocyte

d