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Immediately after ovulation, the mammalian egg is covered by a membrane called:
- a)Chorion
- b)Zona pellucida
- c)Corona radiata
- d)2 & 3
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Immediately after ovulation, the mammalian egg is covered by a membran...
The secondary oocyte forms a new membrane called zona pellucida surrounding it. The Graafian follicle now ruptures to release the secondary oocyte (ovum)
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Immediately after ovulation, the mammalian egg is covered by a membran...
Immediately after ovulation, the layer that forms around the ovum is called corona radiata.
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Immediately after ovulation, the mammalian egg is covered by a membran...
Understanding Egg Membranes in Mammals
The mammalian egg undergoes several transformations post-ovulation, and it is essential to understand the structures that are involved in this process.
1. The Role of the Corona Radiata
- The corona radiata is the layer of cells that surrounds the egg (oocyte) immediately after ovulation.
- This layer is composed of cumulus cells, which provide nutrients and protection to the egg.
- It plays a crucial role in the fertilization process by facilitating the sperm’s interaction with the egg.
2. The Zona Pellucida
- The zona pellucida is a glycoprotein layer that encases the egg.
- It is important for sperm binding and plays a critical role in preventing polyspermy (fertilization by multiple sperm).
- While it is a vital component, it is not the immediate covering after ovulation.
3. Clarifying the Options
- Option a (Chorion): This is an outer membrane that forms part of the placenta in mammals and is not involved immediately after ovulation.
- Option b (Zona Pellucida): Although significant, it is not the first layer to cover the egg post-ovulation.
- Option c (1 and 2): This option incorrectly implies that both membranes are immediately present after ovulation.
Conclusion
Given the definitions and roles of these structures, the correct answer is not option 'D' (Corona Radiata) as stated, but rather it should be option 'b' (Zona Pellucida) as the primary protective layer that surrounds the egg immediately after ovulation. Understanding these layers helps elucidate the complexities of fertilization in mammals.
The mammalian egg undergoes several transformations post-ovulation, and it is essential to understand the structures that are involved in this process.
1. The Role of the Corona Radiata
- The corona radiata is the layer of cells that surrounds the egg (oocyte) immediately after ovulation.
- This layer is composed of cumulus cells, which provide nutrients and protection to the egg.
- It plays a crucial role in the fertilization process by facilitating the sperm’s interaction with the egg.
2. The Zona Pellucida
- The zona pellucida is a glycoprotein layer that encases the egg.
- It is important for sperm binding and plays a critical role in preventing polyspermy (fertilization by multiple sperm).
- While it is a vital component, it is not the immediate covering after ovulation.
3. Clarifying the Options
- Option a (Chorion): This is an outer membrane that forms part of the placenta in mammals and is not involved immediately after ovulation.
- Option b (Zona Pellucida): Although significant, it is not the first layer to cover the egg post-ovulation.
- Option c (1 and 2): This option incorrectly implies that both membranes are immediately present after ovulation.
Conclusion
Given the definitions and roles of these structures, the correct answer is not option 'D' (Corona Radiata) as stated, but rather it should be option 'b' (Zona Pellucida) as the primary protective layer that surrounds the egg immediately after ovulation. Understanding these layers helps elucidate the complexities of fertilization in mammals.
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Immediately after ovulation, the mammalian egg is covered by a membrane called:a)Chorionb)Zona pellucidac)Corona radiatad)2 & 3Correct answer is option 'D'. Can you explain this answer?
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