The zona pellucida represents a formidable barrier to sperm and can be penetrated only after the process called:

Question

Quizplus · Accepted Answer

The acrosome reaction is the process by which the enzymes in the acrosome of the sperm are released, allowing the sperm to penetrate and digest the zona pellucida, which represents a formidable barrier to sperm. Once through the zona pellucida, the sperm can then fuse with the egg. Egg activation and modification of ZP2 are not involved in the penetration of the zona pellucida by sperm. The block to polyspermy occurs after fertilization has already occurred.

The Zona Pellucida Represents a Formidable Barrier to Sperm and Can