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I`m getting confused with the fast block & slow block to check polyspermy. Plz explain in detail.

I`m getting confused with the fast block & slow block to check polyspermy. Plz explain in detail.

Grade:12th pass

1 Answers

Umakant biswal
5359 Points
4 years ago
DEAR arundhati
The 
slow block to polyspermy in the sea urchin embryo consists of a physical barrier to further sperm penetration into the egg. Cortical granule exocytosis results in the formation of the fertilization envelope (often called the fertilization "membrane", even though the structure is not a true membrane)
The 
fast block to polyspermy involves the opening of Na+ channels in the egg plasma membrane. Na+ flows into the egg cell, depolarizing the membrane. This depolarization prevents additional sperm from fusing to the egg plasma membrane. 
HOPE IT CLEARS NOW 
REGARDS 

 

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