The figure shows a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic:
Correct answer: A. B-Corpus luteum - Secretes progesterone
- A. B-Corpus luteum - Secretes progesterone
- B. A-Tertiary follicle - Forms Graafian follicle
- C. B-Corpus luteum - Secretes estrogen
- D. A-Primary oocyte - It is in the prophase I of the meiotic division
Explanation
The zona granulosa and theca cells of Graafian follicle remaining in the ovary after ovulation and some surrounding capillaries and connective tissue evolve into the corpus luteum (a temporary endocrine gland). The corpus luteum produces progesterone and, in the event of fertilization, provides the required progesterone until the placenta is formed. In the absence of fertilization, the life span of the corpus luteum is 14 days. It then degenerates into a corpus albicans, which is mainly a scar tissue.
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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