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प्रश्न
Explain the role of hormones during the menstrual cycle.
उत्तर
The menstruation phase occurs when the concentration of ovarian and gonadotropin hormones is low in the blood. Reduced concentration of these hormones stimulates the hypothalamus to produce GnRH (gonadotropin-releasing hormone). It activates anterior pituitary to gonadotropin hormones.
(i) Pituitary hormones: The pituitary hormones secreted during the menstrual cycle are FSH and LH. The FSH (Follicular stimulating hormone) stimulates the growth of primary oocyte into the secondary oocyte and the Graafian follicle.
The maximum level of LH (Luteinising hormone) induces the rupture of the Graafian follicle to release ovum containing secondary oocyte (ovulation).
(ii) Ovarian hormones: The FSH secretion by pituitary gland stimulates the ovarian follicles to secrete oestrogen. Oestrogen stimulates the proliferation of endometrium of the uterine wall. After ovulation, the remaining cells of the ovarian follicle are stimulated by LH to develop corpus luteum which secretes a large amount of progesterone. Progesterone is essential for the maintenance of endometrium, for implantation of the fertilised ovum and other events of pregnancy.
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संबंधित प्रश्न
the biological/technical terms for Fixing of developing zygote on the uterine wall.
State the names of four hormones which control menstrual cycle.
Expand the acronym.
FSH
Progesterone peaks during which phase of the menstrual cycle?
Mainly which type of hormones control the menstrual cycle in human beings?
Corpus luteum develops from ______.
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 of the following statements is true about the subjects?
Menstruation normally occurs once in ______.
After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form:
In the human menstrual cycle, the ovulation occurs around ______.
