Advertisements
Advertisements
प्रश्न
Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
Advertisements
उत्तर
- Pyramid of energy is a graphical representation of the amount of accumulated energy per unit area in different trophic levels of a food chain.
- An energy pyramid is always upright because there is a gradual decrease in energy at successive trophic levels. This happens because, according to the 10% law of energy transfer, only 10% of the total energy is transferred from one trophic level to another.
- The energy is highest at the producer level and it gradually decreases on moving from herbivores to carnivores.
- As the oestrogen levels increase the endometrium begins to regenerate along with the development of uterine glands and network of blood vessels.
- The corpus luteum starts secreting progesterone, oestrogen, and inhibin. The endometrium proliferates under the influence of these hormones, as do the endometrial gland and blood vessels. Inhibin inhibits FSH and GnRH secretion.
- When there is no fertilisation, the corpus luteum degenerates, progesterone levels drop, and the next menstrual cycle begins.
- Thus, pituitary and ovarian hormones work together to regulate all phases of the menstrual cycle.
APPEARS IN
संबंधित प्रश्न
The human female gonads are ovaries. A maturing egg in the ovary is present in a sac of cells called ______ (1). As the egg grows larger, the follicle enlarges and gets filled with a fluid and is now called the ______ (2) follicle. The process of releasing the egg from the ovary is called ______ (3). The ovum is picked up by the oviducal funnel and fertilization takes place in the ______ (4). In about a weak the blastocyst gets fixed in the endometrium of the uterus and this process is called ______ (5).
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.
Explain the ovarian cycle with its different phases.
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.
Identify the phase of the menstrual cycle during which there is a peak in the level of progesterone.
____________ is transformed to corpus luteum during luteal phase of the menstrual cycle.
Ovulation in the human female normally takes place during the menstrual cycle ______.
At which stage of the menstrual cycle, both LH and FSH are high?
Mention the importance of LH surge during menstrual cycle.
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
