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Questions and Answers
What is the purpose of granulosa cells in the formation of a primordial follicle?
What is the purpose of granulosa cells in the formation of a primordial follicle?
How many primordial follicles are present at birth?
How many primordial follicles are present at birth?
What is the average number of ova that mature and release throughout a woman's reproductive life?
What is the average number of ova that mature and release throughout a woman's reproductive life?
At what point in oogenesis does the first meiotic division occur?
At what point in oogenesis does the first meiotic division occur?
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What happens to the first polar body during oogenesis?
What happens to the first polar body during oogenesis?
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How does male spermatogenesis compare to female oogenesis in terms of gamete production?
How does male spermatogenesis compare to female oogenesis in terms of gamete production?
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What is the main cause of chromosome wastage in oogenesis?
What is the main cause of chromosome wastage in oogenesis?
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What happens to follicles that do not mature and ovulate?
What happens to follicles that do not mature and ovulate?
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What marks the end of a woman's reproductive capacity?
What marks the end of a woman's reproductive capacity?
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Which type of cell surrounds the primary oocyte to form a primordial follicle?
Which type of cell surrounds the primary oocyte to form a primordial follicle?
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How many chromosomes do primary oocytes contain during fetal life?
How many chromosomes do primary oocytes contain during fetal life?
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What happens to the secondary oocyte during oogenesis?
What happens to the secondary oocyte during oogenesis?
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Study Notes
- Primary oocytes form during fetal life and contain 46 replicated chromosomes.
- Each primary oocyte is surrounded by granulosa cells to form a primordial follicle.
- Only about 2 million primordial follicles remain at birth, serving as a reservoir for ova production.
- The follicular pool gradually dwindles away, with only about 400 ova maturing and releasing throughout a woman's reproductive life.
- Oogenesis involves the enlargement of the primary oocyte and completion of the first meiotic division just before ovulation.
- The secondary oocyte becomes the ovum, retaining all nutrient-rich cytoplasm, while the first polar body degenerates.
- Male spermatogenesis produces several hundred million sperm in a single day, in contrast to female gamete potential.
- Considerable chromosome wastage occurs in oogenesis compared to spermatogenesis.
- Follicles can either mature and ovulate or degenerate to form scar tissue.
- Menopause marks the end of a woman's reproductive capacity.
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