The figure given below represents a diagrammatic sketch of the male urinogenital system of a human. [5 MARKS]

(a) Label the parts A to E.
(b) What passes through A and B?
(c) What is the function of the scrotum?
(d) What is the function of the parts labeled D and E?

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Solution

a) 2.5 Marks
b) 1 Mark
c) 0.5 Mark
d) 1 Mark

(a) (A) Vas deferens
(B) Ureter
(C) Urethra
(D) Urinary bladder
(E) Prostate gland

(b) Sperms and urine pass through vas deferens and ureter respectively.

(c) The scrotum suspends the testis outside the abdomen at a temperature (about 2-3^\circ\ lower than the body temperature) suitable for spermatogenesis.

(d) Part D (urinary bladder) stores urine.
Part E (prostate gland) secretes an alkaline fluid which neutralizes the acidic medium of the urethra and keeps the sperms motile. Its secretion constitutes 13 to 33% of the volume of semen.

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