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Polyspermy is prevented by
- a)Depolarization of membrane
- b)Formation of fertilization membrane
- c)Cortical reaction
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Polyspermy is prevented bya)Depolarization of membraneb)Formation of f...
Polyspermy is prevented by Depolarization of membrane due to entry of sperm lead to influx of Ca and then cortical granules release to form fertilization membrane.
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Polyspermy is prevented bya)Depolarization of membraneb)Formation of f...
Polyspermy is the entry of more than one sperm into the egg, which can lead to abnormal development of the embryo. Therefore, it needs to be prevented during fertilization.
There are three mechanisms that prevent polyspermy:
1. Depolarization of membrane:
- Upon fusion of the sperm and egg membranes, the egg membrane undergoes a rapid depolarization, which makes it impermeable to other sperm.
- The depolarization is caused by the influx of calcium ions through the sperm-egg fusion pore, which triggers the cortical reaction.
2. Cortical reaction:
- The cortical reaction is a series of events that occur in the egg cortex (outer layer) upon sperm entry.
- It involves the release of cortical granules, which contain enzymes that modify the zona pellucida (a glycoprotein layer surrounding the egg) and make it impenetrable to other sperm.
- The cortical reaction also causes the formation of the fertilization membrane, which is a barrier that prevents the entry of other sperm.
3. Formation of fertilization membrane:
- The fertilization membrane is a tough layer that forms around the egg after the cortical reaction.
- It prevents the entry of other sperm by physically blocking their access to the egg.
Therefore, the correct answer is option 'D', which includes all of these mechanisms that prevent polyspermy.
There are three mechanisms that prevent polyspermy:
1. Depolarization of membrane:
- Upon fusion of the sperm and egg membranes, the egg membrane undergoes a rapid depolarization, which makes it impermeable to other sperm.
- The depolarization is caused by the influx of calcium ions through the sperm-egg fusion pore, which triggers the cortical reaction.
2. Cortical reaction:
- The cortical reaction is a series of events that occur in the egg cortex (outer layer) upon sperm entry.
- It involves the release of cortical granules, which contain enzymes that modify the zona pellucida (a glycoprotein layer surrounding the egg) and make it impenetrable to other sperm.
- The cortical reaction also causes the formation of the fertilization membrane, which is a barrier that prevents the entry of other sperm.
3. Formation of fertilization membrane:
- The fertilization membrane is a tough layer that forms around the egg after the cortical reaction.
- It prevents the entry of other sperm by physically blocking their access to the egg.
Therefore, the correct answer is option 'D', which includes all of these mechanisms that prevent polyspermy.
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Polyspermy is prevented bya)Depolarization of membraneb)Formation of fertilization membranec)Cortical reactiond)All of theseCorrect answer is option 'D'. Can you explain this answer?
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Polyspermy is prevented bya)Depolarization of membraneb)Formation of fertilization membranec)Cortical reactiond)All of theseCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Polyspermy is prevented bya)Depolarization of membraneb)Formation of fertilization membranec)Cortical reactiond)All of theseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Polyspermy is prevented bya)Depolarization of membraneb)Formation of fertilization membranec)Cortical reactiond)All of theseCorrect answer is option 'D'. Can you explain this answer?.
Polyspermy is prevented bya)Depolarization of membraneb)Formation of fertilization membranec)Cortical reactiond)All of theseCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Polyspermy is prevented bya)Depolarization of membraneb)Formation of fertilization membranec)Cortical reactiond)All of theseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Polyspermy is prevented bya)Depolarization of membraneb)Formation of fertilization membranec)Cortical reactiond)All of theseCorrect answer is option 'D'. Can you explain this answer?.
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