Ion responsible to prevent polyspermy at the time of feilization in mammals is –
Correct Answer: Ca
Description: Ans. is 'c' i.e., Ca Only one sperm can enter into oocyte, and fuher entry of sperms is prevented by the activation of ovum. Fusion of membranes of the gametes (sperm and ovum) leads to ovum activation which involves following events:- Membrane potential of ovum decreases (depolarization). Release of calcium ions from intracellular egg reserve leads to exocytosis of coical granules into the perivitelline space. The spread of coical granules along perivitelline membrane prevents fuher entry of sperm into the ovum. This is called vitelline block to polyspermy.
Category:
Anatomy
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now