Moderate
the acrosome reaction occurs, when the sperm_____________?
Correct answer: B. Comes in contact with zone pellucida
- A. Enters the uterine cavity
- B. Comes in contact with zone pellucida
- C. Penetrates corona radiate
- D. Penetrates cell membrane of oocyte
Explanation
Contact and binding of sperm to receptors on the zona pellucida trigger the acrosome reaction, releasing enzymes that help the sperm penetrate it. The reaction therefore begins before penetration of the oocyte membrane.
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