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प्रश्न
Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females
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उत्तर
Menstrual cycle starts with menstrual flow (3 to 5 days), caused due to the breakdown of the endometrium of the uterus, which is followed by the follicular phase. In this phase, the primary follicles mature into the Graffian follicles. This causes the regeneration of the endometrium.
These changes are brought about by ovarian and pituitary hormones.
• In this phase, the release of gonadotropins (LH and FSH) increases. This causes follicular growth and the growing follicles produce oestrogen.
• The LH and FSH are at their peak in the middle of the cycle (14th day), and cause the rupture of the Graffian follicles to release ovum. This phase is called the ovulatory phase.
• The remains of the Graffian follicles get converted into the corpus luteum, which secretes progesterone for the maintenance of the endometrium.
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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.
The luteal phase of the menstrual cycle is also called the secretory phase. Give reason.
Identify the phase of the menstrual cycle during which there is a peak in the level of progesterone.
The temporary endocrine gland in humans is ______.
Menstruation is triggered by a sudden decline in the amount of hormone secreted by corpus luteum. Identify the hormone.
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. |
Which structure in the ovary will remain functional in subject 2?
Which of the following events is not associated with ovulation in human females?
Mention the importance of LH surge during menstrual cycle.
A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.
