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प्रश्न
Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.
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उत्तर
Follicle-stimulating hormone (FSH) and luteinising hormone are pituitary hormones. Oestrogen and progesterone are ovarian hormones.
Functions of pituitary and ovarian hormones:
| Hormone | Functions |
| FSH | i. Stimulates the ovarian follicles to secrete oestrogen. ii. Stimulates the proliferation of the endometrium of the uterine wall. iii. Stimulates the maturation of Graafian follicles. |
| LH | i. Stimulates the release of ovum. ii. Develops corpus luteum and secretion of progesterone. iii. Maintains pregnancy |
| Oestrogen | i. Controls the changes in the secondary sex organs in the first half of the menstrual cycle. ii. Stimulates growth, maturation and functions of secondary sex organs. iii. Repairs the damaged tissues of the uterus and fallopian tubes after menstruation. iv. Stimulates the maturation of ova development of uterine lining and mammary glands. |
| Progesterone | i. Facilitates the preparation of the endometrium for implantation. ii. Inhibits the contraction of the uterus and the development of new follicles. |
संबंधित प्रश्न
Sketch the labelled diagram.
Menstrual cycle
Explain the changes that occur in the ovary and uterus during menstrual cycle in human females. Mention the influence of pituitary and ovarian hormones in bringing these changes.
Give Reasons
Missing of menses is the first indication of pregnancy.
Find the wrongly matched pair.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Ovulation is the release of the ovum from the Graafian follicle.
(R) - It occurs during the follicular phase of the menstrual cycle.
During which phase of the menstrual cycle does the endometrium thicken up to 8-10 mm?
Which one of the following statements is incorrect about menstruation?
The endometrium in the female is the lining of ______.
Distinguish between pollination and fertilisation. Mention the site and product of fertilisation in a flower.
Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.
The onset of menstruation in women is called ______.
