Male Repro Flashcards
- Consider the pathway traversed by sperm. Which of the following is INCORRECT?
A. Motile sperm leave the seminiferous tubules via straight tubules that open into the rete testis of the mediastinum testis.
B. From the rete testis the sperm travel via the ductuli efferentes into the ductus epididymidis where they mature.
C. At ejaculation the smooth muscle of the epididymidis propels the sperm into the muscular ductus deferens.
D. From the ductus deferens the sperm traverse the ejaculatory duct through the substance of the prostate into the prostatic urethra.
E. From the prostatic urethra the sperm, plus secretions from the prostate and seminal vesicles, traverse the penile urethra to exit from the glans.
A. Motile sperm leave the seminiferous tubules via straight tubules that open into the rete testis of the mediastinum testis.
- The blood-testis barrier is formed by:
A. the basal lamina of the seminiferous tubules and gap junctions between Sertoli cells
B. the basal lamina of the seminiferous tubules and surrounding myoid cells
C. myofibroblasts surrounding the seminiferous tubules
D. tight junctions between Sertoli cells
E. tight junctions between capillary endothelial cells
D. tight junctions between Sertoli cells
- Which of the following cells are located in the basal (abluminal) compartment of a seminiferous tubule? (Note that the stages of prophase of meiosis I are leptotene, zygotene, pachytene, diplotene and diakinesis.)
A. Leptotene and older primary spermatocytes, secondary spermatocytes, spermatids
B. Preleptotene and older primary spermatocytes, secondary spermatocytes, spermatids
C. Secondary spermatocytes and spermatids
D. A spermatogonia and B spermatogonia
E. A spermatogonia, B spermatogonia and preleptotene spermatocytes
E. A spermatogonia, B spermatogonia and preleptotene spermatocytes
- Consider the male excurrent duct system. Which of the following is INCORRECTLY matched?
A. rete testis – simple cuboidal epithelium
B. ductuli efferentes – pseudostratified epithelium with tall columnar
ciliated cells and nonciliated cuboidal cells
C. ductus epididymidis – pseudostratified columnar with stereocilia
D. ductus deferens – simple columnar ciliated epithelium
E. penile urethra – stratified columnar epithelium interspersed with patches of pseudostratified columnar with moist stratified squamous epithelium near the meatus
D. ductus deferens – simple columnar ciliated epithelium
- Which of the following organs consists of many separate glands that secrete part of the ejaculatory fluid and frequently have concretions in the lumen:
A. Bulbourethral glands B. Glands of Littre C. Prostate D. Seminal vesicle E. Testis
C. Prostate
- Consider the Sertoli cell. Which of the following is FALSE?
A. They form the true epithelium of the seminiferous epithelium
B. They are tall, columnar, nonreplicating cells that function as “nurse” or supporting cells for the developing sperm
C. They phagocytose and breakdown the residual bodies formed in the last stage of spermiogenesis
D. LH is stimulatory for Sertoli cell secretion of an androgen-binding protein that is released into the lumen of the seminiferous tubule
E. It secretes inhibin, a protein hormone that provides negative feedback to the anterior pituitary to regulate gonadotropin production
D. LH is stimulatory for Sertoli cell secretion of an androgen-binding protein that is released into the lumen of the seminiferous tubule
- Which of the following is involved in the initiation of erection?
A. Stimulation by he sympathetic nervous system
B. Constriction of the helicine arteries
C. Release of acetylcholine from nerve terminals
D. Decreased flow of blood to the corpus cavernosum
C. Release of acetylcholine from nerve terminals
- Which one of the following statements regarding cells of the seminiferous epithelium is TRUE?
A. Spermatogonia are confined to the compartment on the basal side of the blood-testis barrier
B. Sustentacular (Sertoli) cells divide during each cycle of the seminiferous epithelium
C. Type A dark cells give rise to large numbers of primary spermatocytes by repeated meiotic divisions
D. Interstitial endocrine (Leydig) cells clump together on the luminal side of the blood-testis barrier
E. Spermatids and nearly mature sperm are separated from spermatocytes by the blood-testis barrier
A. Spermatogonia are confined to the compartment on the basal side of the blood-testis barrier
- Secretion of testosterone, the primary androgen, is best described by which one of the following statements?
A. It is secreted by the Sertoli cells of the seminiferous tubules
B. It is secreted in response to cyclical variations in levels of folliclestimulating hormone (FSH)
C. it is secreted by the interstitial cells of the testis (Leydig cells)
D. It is secreted only after stimulation by hypophyseal adrenocorticotropic hormone (ACTH)
E. It is secreted by the gonadotropes of the anterior hypophysis
C. it is secreted by the interstitial cells of the testis (Leydig cells)
- All of the following structures are part of the male genital system EXCEPT
A. efferent ductules B. epididymis C. prostatic urethra D. ureters E. ductus deferens
D. ureters
- Capacitation of sperm is best described by which one of the following characteristics?
A. It occurs entirely in the epididymis
B. It is not necessary for fertilization to occur
C. It includes removal of some sperm surface oligosaccharides while in the female reproductive tract
D. It is completed in the vas deferens and seminal vesicle prior to ejaculation
E. It includes removal of some sperm surface oligosaccharides by secretions of the prostate gland
C. It includes removal of some sperm surface oligosaccharides while in the female reproductive trac
- Throughout its entire length, the muscularis consists of inner and outer longitudinal layers with a middle circular layer of smooth muscles:
A. Efferent ductule B. Epididymis C. Ductus (vas) deferens D. Rete testis E. None of the above.
C. Ductus (vas) deferens
