A nurse explains how one sperm normally fertilises one secondary oocyte. Which reaction helps prevent additional sperm from entering the oocyte?
Correct answer: B. Cortical reaction
- A. Acrosome reaction
- B. Cortical reaction
- C. Capacitation reaction
- D. Decidual reaction
Explanation
The cortical reaction changes the zona pellucida after sperm-oocyte fusion and blocks polyspermy. The acrosome reaction helps sperm penetrate the zona, while capacitation occurs earlier in the female reproductive tract.
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About Reproductive Anatomy and Conception
Female and male reproductive organs, pelvic anatomy, gametogenesis, the menstrual cycle and the hormonal control of ovulation lead into fertilisation, implantation and early embryonic development. Questions distinguish ovulation from menstruation, fertilisation from implantation, and the normal anatomical changes that allow conception and pregnancy to occur.
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