To Penetrate the Zona Pellucida of the Ovum, the Sperm

question 40

Multiple Choice

To penetrate the zona pellucida of the ovum, the sperm

• A) uses the swimming action of the flagellum to move inside the egg.
• B) releases digestive enzymes from the acrosomal cap.
• C) releases a hormone that signals the egg to dissolve the thick coating.
• D) passes down a channel in the protective layer to reach the egg membrane.
• E) stimulates opening of ion channels along the egg membrane by releasing sodium ions from the acrosomal cap.

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