In the Fast Block to Polyspermy,binding of Sperm Opens Up

Multiple Choice

In the fast block to polyspermy,binding of sperm opens up __________ channels,which depolarizes the egg membrane and __________.

A) Na⁺;prevents the entrance of any more sperm
B) Na⁺;prevents the entrance of more Na⁺
C) Na⁺;prevents the entrance of Ca²⁺
D) Ca²⁺;prevents the entrance of any more sperm
E) Ca²⁺;prevents the entrance of more Na⁺