Human Reproduction Question 8
8. Vasa efferentia are the ductules leading from
(a) testicular lobules to rete testis
(b) rete testis to vas deferens
(c) vas deferens to epididymis
(d) epididymis to urethra
Show Answer
Answer : b
Hints & Solutions
(b) Vasa efferentia are ductuless leading from rete testis to vas deferens. The rete testis is an anastomosing network of tubules located in the hilum of the testicles that carries sperm from the seminiferous tubules to the vasa efferentia. The temperature of the testes is regulated by the scrotum (which expands and contracts to facilitate heat transfer) and heat exchange between blood flowing into the testes via the arteries in the spermatic cord, and that flowing out of the testes via the veins in the spermatic cord. This results in the pre-cooling of blood entering the testes, although the precooling mechanism can only regulate testicular temperature to an extent. In situations of extreme heat, the scrotum’s natural cooling mechanism is insufficient to prevent a rise in testicular temperature. The increased testicular temperature may affect both the quality and quantity of the sperm.
