Question

Which constituent of seminal fluid helps in coagulation of semen after ejaculation?
A. Fibrin
B. Fibrinogen
C. Fructose
D. Prostaglandins

Answer 1

Hint: Fibrinogen (factor I) is a liver-made glycoprotein complex circulating in the blood of all vertebrates. It is transformed enzymatically by thrombin to fibrin and then to a fibrin-based blood clot during tissue and vascular injury. In order to avoid bleeding, fibrin clots act mainly to occlude blood vessels.

Complete Answer:
- Semen is a composition of sperm cells and seminal fluid together. The seminal fluid consists of clear and viscous secretions released from the male accessory glands.
- These secretions provide vitamin C, fructose, calcium ions, prostaglandins, citric acid and fibrinogen in the semen.
- Fructose acts as an energy source for the sperm movement. Prostaglandins help in contractions of the female reproductive tract. .The fibrinogen facilitates in seminal clotting after ejaculation. This clotting of the semen helps to keep the ejaculated sperms in the female reproductive tract.

So, the correct answer is option (B) 'Fibrinogen'.

Additional information:
In the process of ejaculation, the sperm passes through the ejaculatory ducts and gets mixed with seminal fluid released from the male accessory glands - seminal vesicles, prostate, and bulbourethral glands to form semen. The seminal vesicles released a yellowish viscous fluid that's wealthy in fructose and different materials that makes up approximately 70% of human semen. The prostate secretes skinny fluid containing proteolytic enzymes, citric acid, acid phosphatase and lipids The bulbourethral glands secrete a clear secretion into the lumen of the urethra to lubricate.

Note: Fibrinogen (factor I) is converted into fibrin in order to form a clot. Fibrin forms insoluble clot when activated from inactive fibrinogen.