46. In males Testosterone a) Is produced by leydig cells b) Promotes growth of t

Question

46. In males Testosterone

     a)      Is produced by leydig cells

     b)      Promotes growth of the pen;is

     c)      Promotes growth of the larynx

     d)      All of the above

47.   Following activation of the parasympathetic system in the pen.is NO is produced which

     a)      Binds directly to calcium channels on vascular smooth muscle causing increased resulting in an erection.

     b)      Binds and activates guanylate cyclase

     c)      Binds and Inhibits Myosin-light chain kinase (MLCK)

     d)      None of the above is correct

48.   Which of the following statements is correct?

     a)      Spermatocytes are fully motile when released into the lumen of the Seminiferous tubules

     b)      During ejaculation the seminal vesicles add fluid containing fructose

     c)      Following ejaculation semen initially clots

     d)      b and c are correct

49. An elderly patient who is institutionalized has extremely low levels of albumin. The

        patience MAP was 85 and constant. Which of the following is likely to occur?

a)      Myogenic regulation would maintain constant GFR

b)      Tubuloglomerular feedback would maintain constant GFR

c)      Sympathetic activity would decrease GFR

d)      a and b

50. A patient has low to non-existing levels of Intrinsic Factor. We would expect:

     a)      Vit. B12 absorption in the stomach to be impaired

     b)      Vit. B12 absorption in the small intestine to be impaired

     c)      Vit. B12 absorption in the large intestine to be impaired

     d)      None of the above

Explanation / Answer

46. in males, testosterone is produced by leydig cells and involved in laryngeal growth. However, it is not involved in penis growth.

Option A and C

47. NO released in response to parasympathetic stimulation activates membrane bound enzyme, guanylate cyclase within nearby arteriolar smooth muscle cells. guanylate cyclase activates cGMP. cGMP activation leads to relaxation of the penile arteriolar smooth muscle bringing about prolonged vasodilation.

Option B.

48. as the sperm leave the testis, the sperm are capable of neither movement nor fertilization. They gain both the capabilities during their passage through epididymis. Sperm’s capacity to fertilize is enhanced further during capacitation in female reproductive tract.

Seminal vesicle supply fructose, secrete prostaglandins and fibrinogen.

Prostate gland secrete clotting enzymes, which act on fibrinogen to produce fibrin that clots semen, helping keep the ejaculated sperm in female reproductive tract during withdrawal of penis. Shortly, the clot is broken down by fibrinolysin, secreted by prostate gland.

Option D. b and c are correct.

50. intrinsic factor helps in absorption of vitamin B12 from small intestine. Vitamin B12 in combination with gastric intrinsic factor is absorbed by receptor mediated endocytosis in terminal ileum.

Option B.

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