In the block to polyspermy,entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise,triggering the cortical reaction.
A) calcium ion
B) ATP
C) phosphate ion
D) sodium ion

Question

Quizplus · Accepted Answer

Entry of the sperm into the oocyte causes an increase in calcium ion levels in the oocyte's cytoplasm, which triggers the cortical reaction. This reaction involves the release of cortical granules that fuse with the oocyte's plasma membrane, which results in the formation of a fertilization membrane that blocks additional sperm from entering.

In the Block to Polyspermy,entry of the Sperm's Contents Causes