The Male Reproductive System
The Male Reproductive System
1. Sexual reproduction entails the union of two gonads to form a zygote. True False
2. Males produce sperm and females produce eggs.
True False
3. The presence of the Y chromosome guarantees the development of male secondary sex organs. True False
4. The mechanism that keeps the testes cooler than the body’s core temperature is called descent of the testes.
True False
5. The scrotum contains the testes and spermatic cords. True False
6. Sperm travels to the ampulla of the ductus deferens before reaching the spermatic cord.
True False
7. Nurse cells secrete inhibin, which regulates the rate of sperm production. True False
8. Testosterone stimulates development of the secondary sex characteristics, spermatogenesis, and libido.
True False
9. Erectile dysfunction prevents ejaculation in most cases. True False
10. At early puberty, follicle stimulating hormone (FSH) and luteinizing hormone (LH) stimulate enlargement
of the testes. True False
11. Spermiogenesis is the last stage of meiosis.
True False
12. Sperm make up just 10% of semen volume. True False
13. Only germ cells undergo meiosis, which produces four haploid (n) cells with 23 chromosomes each. True False
14. Sympathetic nerve fibers trigger the secretion of nitric oxide, which dilates the deep arteries allowing blood
to engorge the penis. True False
15. The first haploid (n) stage of spermatogenesis is prophase II. True False
16. Myotonia of skeletal muscles is characteristic of the excitement phase and refractory period. True False
Multiple Choice Questions
17. Which of the following is generally accepted as a secondary sex characteristic?
A. The enlargement of the breasts
B. The presence of testes
C. The prostate
D. The uterus
E. The vagina
18. Which of the following are primary sex organs?
A. Ova
B. Uterine tubes
C. Breasts
D. Ovaries
E. Scent glands
19. Which of the following is a secondary sex organ?
A. Testis
B. Ovary
C. Vagina
D. Facial hair
E. Distribution of body fat
20. Gonads begin to develop weeks after fertilization.
A. 2 to 3
B. 5 to 6
C. 8 to 9
D. 20 to 24
E. 36 to 38
21. Whether an organism will be genetically male or female is determined by .
A. hormonal, genetic and environmental factors
B. prenatal hormone exposure
C. the egg
D. the sperm
E. the egg and sperm equally
22. The gene that codes for the testis-determining factor (TDF) is found in or on the .
A. Y chromosome
B. X chromosome
C. gonadal ridges
D. fetal testes
E. mesonephros
23. The penis is homologous to the .
A. labia minora
B. mons pubis
C. urethra
D. vagina
E. clitoris
24. The is the gonad and the is the gamete.
A. testis; ovary
B. testis; semen
C. testis; sperm
D. sperm; semen
E. semen; sperm
25. Descent of the testes is stimulated by the .
A. presence of Y chromosome
B. presence of the X chromosome
C. absence of the X chromosome
D. presence of testosterone
E. presence of estrogens
26. The is an example of the female external genitalia.
A. scrotum
B. clitoris
C. uterine tube
D. seminal vesicle
E. vagina
27. The is the small, bilateral organ found lateral to the membranous urethra.
A. seminal vesicle
B. urethra
C. bulbourethral gland
D. prostate
E. ejaculatory duct
28. The golf-ball sized structure found inferior to the urinary bladder, and surrounding the most proximal portion of the urethra, is called the .
A. seminal vesicle
B. urethra
C. bulbourethral gland
D. prostate
E. ejaculatory duct
29. The is the site of sperm maturation and storage.
A. spermatic cord
B. epididymis
C. rete testis
D. seminiferous tubules
E. ductus (vas) deferens
30. The deep region of the penis, surrounding the urethra, that engorges with blood during an erection is known as the .
A. epididymis
B. corpus spongiosum
C. corpus cavernosum
D. scrotum
E. ductus (vas) deferens
31. Which of the following is the correct pathway of sperm cells from their formation to ejaculation?
A. Seminiferous tubule, epididymis, rete testis, urethra, ejaculatory duct, ductus deferens
B. Seminiferous tubule, epididymis, rete testis, ejaculatory duct, ductus deferens, urethra
C. Seminiferous tubule, epididymis, rete testis, ductus deferens, ejaculatory duct, urethra
D. Seminiferous tubule, rete testis, epididymis, ductus deferens, ejaculatory duct, urethra
E. Seminiferous tubule, rete testis, epididymis, ejaculatory duct, urethra, ductus deferens
32. When it is cold, the contracts and draws the testes closer to the body to keep them warm.
A. cremaster
B. pampiniform plexus
C. corpus spongiosum
D. perineum
E. corpus cavernosum
33. The countercurrent heat exchanger that prevents arterial blood from overheating the testes is the
A. rete testis
B. epididymis
C. pampiniform plexus of veins
D. blood-testis barrier
E. scrotal portal system
34. Which of the following is true regarding the blood-testis barrier?
A. It prevents antibodies in the blood from getting to the germ cells.
B. It prevents heat loss from the testes.
C. It prevents blood from getting to the testes.
D. It maintains testis temperature at 35°C.
E. It maintains testis temperature at 37°C.
35. By volume, most of the semen is produced in the .
A. testes
B. penis
C. prostate
D. seminal vesicles
E. bulbourethral glands
36. Which of the following are not found in or around the seminiferous tubules?
A. Interstitial cells
B. Germ cells
C. Nurse cells
D. Spermatids
E. Corpus cavernosum cells
37. The penile urethra is enclosed by the .
A. corpus cavernosum
B. corpus spongiosum
C. trabecular muscle
D. prepuce
E. frenulum
38. Men have only one .
A. bulbourethral gland
B. prostate
C. ejaculatory duct
D. seminal vesicle
E. corpus cavernosum
39. Why would an enlarged prostate interfere with urination?
A. It inhibits urine production.
B. It develops calcified deposits that block the urethra.
C. It produces thicker prostatic secretions that block the urethra.
D. It inhibits the micturition reflex.
E. It compresses the urethra.
40. The penis is innervated by the nerve.
A. internal pudendal
B. obturator
C. penile
D. ventral
E. external pudendal
41. Which of the following does not play a role in thermoregulation of the testes?
A. The bulbospongiosus muscle
B. The cremaster
C. The pampiniform plexus of veins
D. The countercurrent heat exchanger
E. The dartos muscle
42. When do the testes start secreting testosterone?
A. In the first trimester of fetal development
B. In the first trimester after birth
C. In the first three years after birth
D. In the first three years of adolescence
E. After the first ejaculation
43. Which of the following hormones directly stimulates the development of male secondary sex characteristics?
A. Estrogen
B. Inhibin
C. Luteinizing hormone
D. Follicle stimulating hormone
E. Testosterone
44. Which of the following is an androgen?
A. Estrogen
B. Progesterone
C. Testosterone
D. Luteinizing hormone (LH)
E. Follicle-stimulating hormone (FSH)
45. stimulates the interstitial cells of the testes to secrete .
A. Gonadotropin-releasing hormone (GnRH); LH
B. Follicle-stimulating hormone (FSH); androgen-binding protein (ABP)
C. Luteinizing hormone (LH); androgen-binding protein (ABP)
D. Luteinizing hormone (LH); testosterone
E. Luteinizing hormone (LH); estrogen
46. Which hormone suppresses spermatogenesis without affecting testosterone secretion?
A. Gonadotropin-releasing hormone (GnRH)
B. Testosterone itself
C. Inhibin
D. Luteinizing hormone (LH)
E. Follicle-stimulating hormone (FSH)
47. The has/have no androgen receptors and do/does not respond to it.
A. germ cells
B. muscular tissue
C. nurse cells
D. hypothalamus
E. pituitary gland
48. Which of the following is inhibited by testosterone?
A. Libido
B. Development of secondary sex organs
C. Development of secondary sex characteristics
D. Gonadotropin-releasing hormone (GnRH) secretion
E. Sperm production
49. Changes called male climacteric are a consequence of a(n) .
A. increased secretion of estrogens
B. increased secretion of progesterone
C. decreased secretion of testosterone
D. increased secretion of FSH and LH
E. increased secretion of GnRH
50. The haploid (n) result of meiosis I is called a .
A. spermatogonium
B. secondary spermatocyte
C. primary spermatocyte
D. spermatid
E. sperm
51. In the process of spermiogenesis, become .
A. spermatocytes; spermatozoa
B. spermatozoa; spermatids
C. spermatogonia; spermatocytes
D. spermatocytes; spermatids
E. spermatids; spermatozoa
52. In meiosis, each parent cell produces .
A. two haploid (n) cells
B. four haploid
(n) cells
C. two diploid (2n) cells
D. four diploid (2n) cells
E. haploid (n) cells that are identical to the parent cell
53. The process of spermatogenesis and spermiogenesis begins with a and ends with four
A. sperm cell; interstitial cells
B. sperm cell; nurse cells
C. secondary spermatocyte; spermatocytes in general
D. secondary spermatocyte; germ cells
E. germ cell; gametes
54. At the end of meiosis I there are , whereas at the end of meiosis II there is/are .
A. two diploid (2n) cells; one diploid (2n) cell
B. two diploid (2n) cells; one haploid (n) cell
C. two diploid (2n) cells; four haploid
(n) cells
D. two haploid (n) cells; four haploid (n) cells
E. two haploid (n) cells; one diploid (2n) cell
55. Which of the following is the most important role of meiosis in sexual reproduction?
A. It reduces the size of the gametes.
B. It produces at least one gamete that is mobile.
C. It prevents the chromosome number from doubling in each generation.
D. It ensures that each daughter cell doubles the number of chromosomes.
E. It changes the genetic composition of each chromosome.
56. At what stage does a developing sperm cell begin to grow a tail?
A. Spermatozoon
B. Spermatid
C. Primary spermatocyte
D. Secondary spermatocyte
E. Spermatogonium
57. Sperm cells get energy to power their movement from , which is contributed by the
A. prostaglandins; prostate
B. sucrose; bulbourethral gland
C. fructose; seminal vesicles
D. seminogelin; prostate
E. semen; seminiferous gland
58. Male infertility (sterility) refers to .
A. the inability to fertilize an egg
B. low sperm count
C. a lack of seminal fluid during ejaculation
D. low levels of testosterone
E. the inability to have an erection
59. The acrosome contains enzymes used to .
A. dissolve the mucosa of the vagina
B. dissolve the mucosa of the uterus
C. dissolve the stickiness of the semen
D. penetrate the vagina
E. penetrate barriers surrounding the ovum
60. have 46 chromosomes, whereas have 23.
A. Spermatids; spermatozoa
B. Primary spermatocytes; spermatids
C. Secondary spermatocytes; primary spermatocytes
D. Spermatogonia; primary spermatocytes
E. Type A spermatogonia; type B spermatogonia
61. A sperm count any lower than million sperm per mL of semen is usually associated with infertility (sterility).
A. 250 to 500
B. 200 to 250
C. 100 to 200
D. 50 to 100
E. 20 to 25
62. Dilation of the causes the lacunae to fill with blood and the penis to become erect.
A. helicine arteries
B. internal pudendal (penile) arteries
C. dorsal arteries
D. dorsal veins
E. deep arteries
63. The orgasm-emission phase of the male sexual response is stimulated by .
A. efferent sympathetic signals from the sacral region of the spinal cord
B. efferent sympathetic signals from the lumbar region of the spinal cord
C. efferent parasympathetic signals from the sacral region of the spinal cord
D. efferent parasympathetic signals from the lumbar region of the spinal cord
E. efferent somatic signals from the thoracic region of the spinal cord
64. Which of the following explains the neural mechanism of an erection?
A. It is an autonomic reflex mediated predominantly by parasympathetic nerve fibers.
B. It is an autonomic reflex mediated predominantly by sympathetic nerve fibers.
C. It is a somatic reflex mediated predominantly by parasympathetic nerve fibers.
D. It is a somatic reflex mediated predominantly by sympathetic nerve fibers.
E. It is an exclusively voluntary action mediated by the cerebral cortex.
65. Heart rate, blood pressure, and respiratory rate peak during the .
A. excitement phase
B. erection of the penis
C. climax (orgasm)
D. plateau phase
E. resolution phase
66. Sildenafil (Viagra) prolongs erection by .
A. activating nitric oxide (NO) production
B. inactivating guanylate cyclase
C. stimulating production of cGMP
D. inhibiting degradation of cGMP
E. inhibiting nitric oxide (NO) production
67. Which of the following is not a change in the male body that results from puberty?
A. Deepening of the voice
B. Gain in muscle mass
C. Growth of the scrotum and penis
D. Acne
E. These are all changes associated with male puberty.
68. Which of the following is not a function of the nurse cells?
A. They secrete inhibin.
B. They secrete androgen-binding protein.
C. They secrete testosterone.
D. They protect and support the germ cells.
E. Their tight junctions form the blood-testis barrier.
True / False Questions
69. Genetic males are XY and genetic females are XX. True False
Collepals.com Plagiarism Free Papers
Are you looking for custom essay writing service or even dissertation writing services? Just request for our write my paper service, and we'll match you with the best essay writer in your subject! With an exceptional team of professional academic experts in a wide range of subjects, we can guarantee you an unrivaled quality of custom-written papers.
Get ZERO PLAGIARISM, HUMAN WRITTEN ESSAYS
Why Hire Collepals.com writers to do your paper?
Quality- We are experienced and have access to ample research materials.
We write plagiarism Free Content
Confidential- We never share or sell your personal information to third parties.
Support-Chat with us today! We are always waiting to answer all your questions.
