Question

What would happen if vasa deferentia of man are cut?
A. Sperm are non-nucleate
B. Spermatogenesis does not occur
C. Semen is without sperms
D. Sperms are non motile

Answer 1

Hint: The vasa deferentia are a part of the male reproductive system and these ducts transports sperms from the epididymis to the ejaculatory duct. It is a partially coiled tube which exits the abdominal cavity through the opening called the inguinal canal.

Complete answer:
The vas deferens also known as ductus deferens. The vas deferens dilates to form an ampulla, which receives the duct from the seminal vesicles behind the urinary bladder and forms an ejaculatory duct.
During ejaculation, smooth muscles of vas deferens contracts and sperm moves forward. The sperm is transferred from each vas deferens into urethra.
Vasectomy is a method in which the vasa deferentia are permanently cut and due to this semen is without sperms. Semen is a mixture of sperms and seminal fluid, the average volume of semen in an ejaculation is 2.5-5 ml, with a sperm count of 200-300 millions. Semen has a ph of 7.2 to 7.7 which is slightly alkaline and the prostatic secretions give semen a milky appearance whereas the fluid from seminal vesicles and bulbourethral gland gives a sticky appearance. Semen provides nutrients and transportation medium and neutralizes the acidic environment of the female vagina.

So the correct answer is option C.

Note: Seminal vesicles are paired, tubular, coiled glands situated behind the bladder. They secrete viscous fluid which constitutes the main part of ejaculate and contains fructose, citric acid and prostaglandins.