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Question
Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
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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the Biological/technical term for Complete stoppage of menstrual cycle in females
Differentiate between the following pair:
Menarche and menopause
Multiple Choice Question:
The onset of menstruation in the female is termed
What are the phases of the menstrual cycle? Indicate the changes in the ovary and uterus.
Which one of the following events occurs during the secretory phase of the menstrual cycle?
The correct sequence of hormone secretion from the beginning of menstruation is ______.
A biology student after studying the different levels of hormones during the menstrual cycle was comparing 2 subjects (Patients). A table was created after looking at the levels of hormones A and B for Subjects 1 and 2. Read the information in the table and answer the question that follows.
| HORMONE A | HORMONE B | |
| Subject 1 | Shows a peak on the 14th Day of the menstrual cycle. | Falls down during the luteal phase. |
| Subject 2 | Shows a peak on the 14th Day of the menstrual cycle. | The level is maintained high in the luteal phase. |
Subject 2 has a higher level of hormone B, which is ______
Which of the following events is not associated with ovulation in human females?
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
Name the following:
The permanent stoppage of menstruation in human females around the age of 45 years.
