Question

The common passage for sperms and urine in the male reproductive system is…………
A) Ureter
B) Seminal vesicle
C) Urethra
D) Vas deferens

Answer 1

Hint:Reproductive strategies are structural, functional and behavioral adaptations that improve the chances of fertilization or increase the survival rate of offspring. The ultimate aim of each species is to produce the maximum number of surviving offspring using the least amount of energy. Vertebrates have developed many strategies to ensure the success of reproduction and the survival of the offspring.

Complete answer:
The male reproductive system is composed of a pair of testes, genital ducts, accessory glands and the penis. The two testes are the male gonads, where the male gametes or sperms are made. Each testis is an ovoid body measuring 5cm in length, 2cm in breadth and 3cm in height and weighs about 5 to 7 grams.

The testicular wall is composed of a fibrous coat called tunica albuginea. Inside each testis, there are seminiferous tubules; the walls of it produce the sperm by a process called spermatogenesis. Between these tubules are special cells known as leydig cells or interstitial cells, they secrete the male sex hormone testosterone. From the testes the sperms are collected by 10 to 20 vasa efferentia and are transported to the epididymis. The epididymis is a highly coiled tube, about 6m long, sperm concentration and maturation occur within this tube.

A straight tube arises from the base of the epididymis and vas deferens which is 40 cm long and carries sperm to the urethra. Most of the sperms are stored in the vas deferens. Another tube urethra carries sperm from the vasa deferentia and urine from the urinary bladder, through the penis.

Thus,the correct answer is option (C) Urethra.

Note:The semen is composed of the fluid and sperm from the vas deferens (about 10% of the total), fluid from the seminal vesicles (60%), fluid from the prostate gland (about 30%). The pH combined semen is about 7.5. During the process of ejaculation the semen is expelled from the urethra. During ejaculation the sphincter at the base of the urinary bladder is closed so that sperm can’t enter the bladder or urine can be expelled from it.