NEET PG Medical – 2019 – Question – 17
Hormone predominately secreted after 14 day on endometrium is?
a) Progesterone
b) Estrogen
c) LH
d) FSH
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Correct Answer – A
Ans: A. Progesterone.
Events of ovarian cycle:
- Bleeding continues for about 4 days.
- By 5th day, ovarian follicle is sufficiently developed.
- Secretes considerable quantities of estrogen.
During pre-ovulatory phase:
- Estrogen influencesendometrial proliferative changes.
- Hence, “Preovulatory phase of uterine cycle” also referred “Proliferative phase”.
During post-ovulatory phase:
- Endometrium enters secretory phase.
- Hence, “Postovulatory phase of uterinecycle” also referred “Secretory phase”.
- Due to combined action of estrogen & progesterone.
Progesterone:
- More important & responsible for secretory changes.
- Peaks on 21st day.
End of secretory phase:
- Estrogen-primed endometrium.
- Degeneration of corpus luteum declines estrogen & progesterone levels.
- Results in withdrawal bleeding – Menstruation.
