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What is the order of layers or spaces from outside to inside of ovum?
- a)Perivitelline space - Plasma membrane - Zona pellucida
- b)Plasma membrane - Perivitelline space - Zona pellucida
- c)Perivitelline space - Zona pellucida - Ovum cytoplasm
- d)Zona pellucida - Perivitelline space - Plasma membrane
Correct answer is option 'D'. Can you explain this answer?
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What is the order of layers or spaces from outside to inside of ovum?a...
Understanding the Structure of the Ovum
The ovum, or egg cell, is surrounded by several layers that play crucial roles in fertilization and protection. Here’s a detailed breakdown of the layers from the outside to the inside:
1. Zona Pellucida
- The zona pellucida is the outermost layer surrounding the ovum.
- It is a glycoprotein matrix that provides a protective barrier and is essential for sperm recognition and binding during fertilization.
- This layer is crucial as it prevents polyspermy, ensuring that only one sperm fertilizes the egg.
2. Perivitelline Space
- Inside the zona pellucida lies the perivitelline space, which is a fluid-filled area.
- This space acts as a buffer and provides a medium for the transport of nutrients and signals between the ovum and surrounding structures.
- It is essential for the process of fertilization, allowing sperm to access the ovum.
3. Plasma Membrane
- The innermost layer is the plasma membrane of the ovum itself.
- This membrane is vital for maintaining the internal environment of the ovum and regulating the movement of substances in and out of the cell.
- Once a sperm penetrates this membrane, it triggers a series of events leading to fertilization.
Conclusion
In summary, the correct order of layers from outside to inside of the ovum is:
Zona Pellucida - Perivitelline Space - Plasma Membrane
This understanding is critical for comprehending reproductive biology, especially in the context of fertilization and embryonic development, as seen in examinations like NEET.
The ovum, or egg cell, is surrounded by several layers that play crucial roles in fertilization and protection. Here’s a detailed breakdown of the layers from the outside to the inside:
1. Zona Pellucida
- The zona pellucida is the outermost layer surrounding the ovum.
- It is a glycoprotein matrix that provides a protective barrier and is essential for sperm recognition and binding during fertilization.
- This layer is crucial as it prevents polyspermy, ensuring that only one sperm fertilizes the egg.
2. Perivitelline Space
- Inside the zona pellucida lies the perivitelline space, which is a fluid-filled area.
- This space acts as a buffer and provides a medium for the transport of nutrients and signals between the ovum and surrounding structures.
- It is essential for the process of fertilization, allowing sperm to access the ovum.
3. Plasma Membrane
- The innermost layer is the plasma membrane of the ovum itself.
- This membrane is vital for maintaining the internal environment of the ovum and regulating the movement of substances in and out of the cell.
- Once a sperm penetrates this membrane, it triggers a series of events leading to fertilization.
Conclusion
In summary, the correct order of layers from outside to inside of the ovum is:
Zona Pellucida - Perivitelline Space - Plasma Membrane
This understanding is critical for comprehending reproductive biology, especially in the context of fertilization and embryonic development, as seen in examinations like NEET.
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Community Answer
What is the order of layers or spaces from outside to inside of ovum?a...
The correct order of layers or spaces from outside to inside is:
- Zona pellucida: The glycoprotein layer surrounding the oocyte.
- Perivitelline space: The space between the zona pellucida and the plasma membrane of the oocyte.
- Plasma membrane: The membrane that encloses the oocyte cytoplasm.
Thus, the order is Zona pellucida → Perivitelline space → Plasma membrane.
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