12 Questions
What is the purpose of granulosa cells in the formation of a primordial follicle?
To form a protective barrier around the oocyte
How many primordial follicles are present at birth?
2 million
What is the average number of ova that mature and release throughout a woman's reproductive life?
400
At what point in oogenesis does the first meiotic division occur?
Just before ovulation
What happens to the first polar body during oogenesis?
It degenerates
How does male spermatogenesis compare to female oogenesis in terms of gamete production?
Male spermatogenesis produces more gametes than female oogenesis
What is the main cause of chromosome wastage in oogenesis?
Errors during meiotic division
What happens to follicles that do not mature and ovulate?
They degenerate to form scar tissue
What marks the end of a woman's reproductive capacity?
Menopause
Which type of cell surrounds the primary oocyte to form a primordial follicle?
Granulosa cells
How many chromosomes do primary oocytes contain during fetal life?
46 replicated chromosomes
What happens to the secondary oocyte during oogenesis?
It becomes the ovum
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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