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प्रश्न
Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
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उत्तर
(a) The menstrual cycle is the reproductive cycle in all primates and begins at puberty (menarche).
- Menses takes place on the 3rd–5th day of the menstrual cycle of 28 days.
- The production of LH is considerably reduced.
- This causes degeneration of the corpus luteum and reduction in the production of progesterone and oestrogen.
- The uterine endometrium breaks down and menstruation starts.
- Cells of the endometrium, secretions, blood and the unfertilised ovum constitute menstrual flow.
During this phase, the levels of ovarian and pituitary hormones are low.
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संबंधित प्रश्न
Identify True/False statement. Correct false statement to make it true.
Menstrual cycle ceases during pregnancy.
Give a significant point of difference between the oestrous and menstrual cycles.
Give appropriate terms for each of the following process:
Fixing of developing zygote (blastocyst) on the uterine wall.
What is menstrual cycle? Describe it in brief.
Find the wrongly matched pair.
Explain the various phases of the menstrual cycle.
Which hormone is secreted by the developing secondary follicles?
Corpus luteum ______.
Hormones responsible for menstrual cycle are produced from ______.
What condition can cause a temporary stop in the menstrual cycle besides pregnancy?
