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Sperm tunneling through the barriers surrounding an ovum s754

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Sperm tunneling through the barriers surrounding an ovum s754

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Questions and Answers

How does the fertilizing sperm penetrate the corona radiata?

Via membrane-bound enzymes in the plasma membrane of its head (correct)

By breaking through the zona pellucida

By pushing its way through the ovum's cytoplasm

By fusing with the ovum's plasma membrane

What are the ZP3 receptors?

Receptors on the zona pellucida (correct)

Enzymes in the acrosome

Receptors on the ovum's plasma membrane

Enzymes in the cortical granules

What triggers the acrosome reaction?

Binding of sperm to ZP3 receptors (correct)

Fusion of the sperm and ovum plasma membranes

Release of enzymes from cortical granules

Digestion of the zona pellucida by acrosomal enzymes

What do the acrosomal enzymes do?

Digest the zona pellucida Signup and view all the answers

What happens when the sperm reaches the ovum?

The plasma membranes of the two cells fuse Signup and view all the answers

What enters the ovum cytoplasm?

The sperm head with its DNA Signup and view all the answers

What do the enzymes stored in cortical granules do?

Inactivate ZP3 receptors Signup and view all the answers

What is the block to polyspermy?

Hardening of the zona pellucida Signup and view all the answers

What is the corona radiata?

A layer of cells surrounding the ovum Signup and view all the answers

What is the zona pellucida?

A layer surrounding the ovum Signup and view all the answers

What is the acrosome?

A structure on the head of the sperm containing hydrolytic enzymes Signup and view all the answers

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