In the slow block to polyspermy,what most directly stimulates the cortical granules to release their contents into the perivitelline space?

Question

Quizplus · Accepted Answer

The slow block to polyspermy is triggered by an influx of Ca⁺⁺ ions into the egg, which causes the cortical granules to release their contents into the perivitelline space. This changes the physical properties of the egg's surface, making it impermeable to additional sperm. Protamines are proteins found in sperm that help to package DNA, and are not involved in the cortical reaction. Na⁺ and hyaluronidase are not directly involved in the slow block to polyspermy. ZP₃ is a protein that makes up part of the zona pellucida, the outer layer of the egg, but is not directly involved in the cortical reaction.

In the Slow Block to Polyspermy,what Most Directly Stimulates the Cortical