In males, testosterone (or DHT) stimulates all of the following EXCEPT: a. pubertal growth of the penis, which will be permanent b. thelarche Answer B c. lowering of pitch of the voice, which will be permanent d. hair growth on chest and face e. hair growth up the midline of the abdomen dinea alba
Estrogen directly produces all of the following EXCEPT: a. secretion by uterine endometrial glands b. pituitary hypertrophy c. increased contractility of uterine and oviduct. AnswerC d. mammary gland growth e. stimulation of a thin, watery secretion by cervical glands muscles
The plasma concentration of hCG: a. increases steadily pregnancy b. increases beginning about 2 months after fertilization c. increases beginning less than 2 weeks after fertilization d. peaks 4-6 months after fertilization e. Both C and D are correct. answerE
An assay of serum samples from a normal woman with a history of regular 28-day cycles indicates that, during the last 12h, there has been a peak in the serum concentration of estradiol-17 B in the absence of any detectable progesterone. Which of the following can be expected to occur within 3 days? a. cessation of menstruation b. decreased basal body temperature c. onset of menstruation answer C d. ovulation e. regression of the corpus luteum
The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is a. Spermatogonia-spermatid-spermatocyte-sperms b. Spermatocyte-spermatogonia-spermatid-sperms c. Spermatogonia-spermatocyte-spermatid-sperms. answer C d. Spermatid-spermatocyte-spermatogonia-sperms e. None of the above
The testes in humans are situated inside the scrotum outside the abdominal cavity. The purpose served is for: a. providing a secondary sexual feature exhibiting male sex temperature b. maintaining scrotal temperature below the internal body. answer B c. escaping possible compression by the visceral organs d. providing more space for the growth of the epididymis e. prevention of cryptorchidism
Sperm capacitation a. is caused by the zona pellucida b. is essential for fertilization. answer B c. occurs in the male d. prevents polyspermy e. removes the head of the sperm
All of the following occur during spermiogenesis except: a. spermatids lose much of their cytoplasm and grow a flagellum b. sperm cells, or spermatozoa, are formed c. sperm become completely ready to fertilize an egg cell d. the acrosome is formed e. the nucleus loses water. answer E
The acrosome reaction occurs: a. When the spermatozoa are traveling through the uterine cavity. b. Just before the penetration of corona radiata. c. When the sperm cell membrane comes in contact with the corona radiata cells. d. When the sperm cell membrane comes in contact with the zona pellucida. answer D e. When the sperm head has penetrated through the zona pellucida.
The function of the cremaster muscle is to a. reduce the surface area of the scrotum to reduce heat loss b. elevate the testes during sexual arousal and exposure to cold. answer B c. generate peristaltic waves in the ductus deferens d. control the release of secretions from the seminal vesicles e. control the release of sperm cells from the testes into the epididymis
The immune system does NOT normally attack spermatogenic cells because a. they are recognized as “self” structures. b. they do not have any antigens on their cell membranes. c. spermatogenic cells are protected by the blood-testis barrier. answer C d. the acrosome covers any antigens that would be recognized as foreign. e. they shed proteins which mask them from recognition
Which of the following statements about spermatogenesis is INCORRECT? a. Spermatogonia have diploid chromosome number b. Sertoli cells are the temporal and spatial organizers of spermatogenesis. answer B c. Primary spermatocytes are the product of the first meiotic division d. Spermatids have a haploid chromosome number e. Spermiogenesis is the cytoplasmic remodeling of spermatids to form spermatozoa
What reproductive organ(s) of the female secretes fluid for vaginal lubrication during coitus? a. uterine tubes b. labia majora c. vestibular glands. answer C d. pudendal cleft e. clitoris
When do the oogonia begin meiosis in the female? a. at puberty b. monthly during menstruation c. at age 20 d. toward the end of gestation of the female fetus. answer D e. at ovulation
Which stage of the follicle is arrested in prophase? a. Primordial follicle b. Primary follicle c. Secondary follicle. answer C d. Mature follicle e. Gravan follicle
The ovaries are covered on the outside by a. Follicle b. Germinal epithelium. answer B c. Tunica vaginalis d. Tunica albuginea e. Tunica vasculosa
The hormone that is essential for intrauterine development of male external genitalia is: a. testosterone b. dihydrotestosterone. answer B c. Mullerian regression factor d. 5 a-reductase e. SOX factor
Which of the following is a correct statement about the production of human sperm? a. Spermatogonia undergo meiosis answer A b. Spermatogenesis occurs in the epididymis c. Normally, 10 to 20 million sperm are produced daily d. FSH is required e. Complete maturation of spermatozoa occurs in about 1 month
Functions of the Sertoli cells in the seminiferous tubules include a. Secretion of FSH into the tubular lumen b. Secretion of testosterone into the tubular lumen c. Maintenance of the blood-testis barrier d. Synthesis of estrogen after puberty. answer D c. Expression of surface LH receptors
An indication that ovulation has taken place is a. An increase in serum FSH levels b. A drop in body temperature c. An increase in serum LH levels. answer C d. An increase in serum progesterone levels e. An increase in serum estrogen levels
Which one of the following statements about semen is correct? a. The bulk of semen volume is contributed by the prostate gland. answer A b. It prevents sperm capacitation c. It buffers vaginal alkalinity d. It activates sperm motility in the male tract e. Sperm counts have increased over the last 20 years
Testicular feminization syndrome is caused by mutations in genes coding for: a. androgen-binding proteins b. Sa reductase c. androgen receptor. answer C d. inhibin
The blood-testis barrier is formed by tight junctions between: a. Leydig cells b. Sertoli cells. answer B c. Spermatids d. primary spermatogonia
The process of spermiogenesis produces a. spermatozoa b. primary spermatocytes. c. secondary spermatocytes d. spermatids. answer D
Sperm are moved along the ductus deferens by a. hydrostatic force. b. ciliary action. c. peristaltic contractions. answer C d. suction.
The organ that recycles damaged spermatozoa, and is the site of sperm maturation is the a. ductus deferens, b. rete testis. c. seminal vesicle. d. epididymis. answer D
Produces a secretion that contains fructose, prostaglandins, and fibrinogen a. Prostate gland. b. Bulbourethral gland c. Seminal vesicle. answer C d. Corpus cavernosum
Semen contains all of the following, EXCEPT a. spermatozoa. b. seminal fluid. c. prostaglandins. d. spermatogonia. answer D
The role of FSH in males is to a. stimulate the interstitial cells to produce testosterone. b. stimulate the nurse cells to produce inhibin. c. initiate sperm in the testes. answer C d. influence sexual behaviors and sex drive.
The pituitary hormone that stimulates the interstitial cells to secrete testosterone is a. FSH. b. LH. answer B c. ACTH. d. ADH.
Which is NOT a function of testosterone? a. Onset of spermatogenesis b. Maintenance of accessory ducts c. Release of semen. answer C d. Maintenance of accessory glands
In spermatogenesis, the phases of maturation involve a. formation of spermatids from primary spermatocytes through meiosis. answer A b. growth of spermatogonia into primary spermatocytes c. formation of spermatogonia from gonocytes through mitosis d. formation of oogonia from spermatocytes through meiosis
The process of spermatogenesis is induced by a. TSH b. FSH. answer B c. MSH d. ACTH
The number of spermatozoa, a single primary spermatocyte finally produced in spermatogenesis is a. 2 b. 4 answer B c. 6 d. 8
The onset of spermatogenesis starts at a. puberty. answer A b. birth c. adulthood d. intercourse
The process of conversion of spermatids to sperms is called a. spermiation b. spermatogenesis c. spermiogenesis answer C d. meiosis
is the process of release of sperms from Sertoli cells. a. Spermiation. answer A b. Spermatogenesis c. Spermiogenesis d. Meiosis
Emission and ejaculation a. occurs under sympathetic stimulation. b. begins with peristaltic contractions of the ampulla. c. involves contractions of the bulbospongiosus muscle. d. all of the above. answer D
Contractions of the bulbospongiosus muscles result in a. erection. b. emission. c. ejaculation. answer C d. impotence.
The male reproductive system is most closely associated with one of the following systems: a. muscular b. urinary. answer B c. endocrine d. digestive
Sustentacular cells a. are found in the seminiferous tubules. b. form the blood-testis barrier. c. coordinate spermatogenesis. d. a, b, and c. answer D
Which of the following occurs after a spermatogonium completes cell division? a. Mature spermatozoa enter the lumen b. The daughter cell is directed toward the lumen of the seminiferous tubule. answer B c. Gamete production accelerates. d. Spermiogenesis begins.
Testicular Sertoli cells function in ALL of the following ways, except that they DON’T a. secrete progesterone-binding protein. answer A b. coordinate spermiogenesis c. support meiosis d. serve as a blood-testis barrier
Secondary spermatocytes each contain a. 23 chromosomes. answer A b. 23 pairs of chromosomes. c. 46 pairs of chromosomes. d. 46 chromosomes.
The Sertoli cells of the seminiferous tubule perform the following functions EXCEPT d. secrete follicle stimulating hormone answer D
The male gamete is also known as the a. sperm. answer A b. testes c. seminiferous tubule d. penis
During the meiotic phase of spermatogenesis, each primary spermatocyte undergoes the first meiosis to produce……….spermatocytes a. two primary b. two secondary. answer B c. one secondary d. one primary
Which of the following part of the sperm contains the nucleus? a. Head. answer A b. Middle piece c. Tail d. Acrosome
The…. of the sperm contains mitochondria that provide energy for locomotion and metabolism. a. Head b. Middle piece answer B c. Tail d. Acrosome