11 Questions
How does the fertilizing sperm penetrate the corona radiata?
Via membrane-bound enzymes in the plasma membrane of its head
What are the ZP3 receptors?
Receptors on the zona pellucida
What triggers the acrosome reaction?
Binding of sperm to ZP3 receptors
What do the acrosomal enzymes do?
Digest the zona pellucida
What happens when the sperm reaches the ovum?
The plasma membranes of the two cells fuse
What enters the ovum cytoplasm?
The sperm head with its DNA
What do the enzymes stored in cortical granules do?
Inactivate ZP3 receptors
What is the block to polyspermy?
Hardening of the zona pellucida
What is the corona radiata?
A layer of cells surrounding the ovum
What is the zona pellucida?
A layer surrounding the ovum
What is the acrosome?
A structure on the head of the sperm containing hydrolytic enzymes
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