Explain the Menstrual Phase in a Human Female. State the Levels of Ovarian and Pituitary Hormones During this Phase. - Biology

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Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.

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Solution

(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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2015-2016 (March) All India Set 1

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