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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
Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.
Define: Menarche
Name the Following
Sloughing of the uterine wall during menstrual flow.
Detection of which hormone in urine is an indicator of pregnancy?
Match the Columns.
| Column I | Column II | ||
| i. | Proliferative phase | a. | Breakdown of the endometrial lining |
| ii. | Secretory phase | b. | Follicular phase |
| iii. | Menstruation | c. | Luteal phase |
Proliferative phase of menstrual cycle, is also called ______.
The menstrual cycle begins with ______
Identify the correct statement from the following:
In the figure given below, parts A and B show the level of hormones which influence the menstrual cycle. Study the figure and answer the questions that follow:
- Name the organs which secrete the hormones represented in parts A and B.
- State the impact of the hormones in part B on the uterus of the human female during 6 to 15 days of the menstrual cycle.
Match Column I and Column II with respect to the menstrual cycle.
| Column I | Column II |
|---|---|
| i. Menstrual phase | c. Secretion of inhibin |
| ii. Follicular phase | b. Development of the primary follicle |
| iii. Ovulatory phase | a. Rapid secretion of LH |
| iv. Secretory phase | d. Secretion of estrogen |
Choose the correct option.
