NEET BIOLOGY

Detailed explanation-1: -As the follicle grows, blood levels of estrogen rise significantly by cycle day seven. This increase in estrogen begins to inhibit the secretion of FSH. The fall in FSH allows smaller follicles to die off.

Detailed explanation-2: -Oestrogen also inhibits the release of LH and FSH. If a woman becomes pregnant progesterone will continue to be produced by the placenta, preventing the maturation of another follicle.

Detailed explanation-3: -Oestrogen is released, which helps to develop the uterus lining again, in preparation for the new egg. The egg is released due to high LH. Oestrogen increases the amount of LH, and decreases the amount of FSH. This causes the egg to be released from the follicle – a process called ovulation.

Detailed explanation-4: -FSH secretion is suppressed by negative feedback of the ovarian hormones estradiol, inhibin, and progesterone during the early and midluteal phase.

Detailed explanation-5: -Oestrogen is a female sex hormone produced by follicles in the ovaries. The most important job of oestrogen is to regulate the menstrual cycle. It makes the lining of the uterus – the endometrium – thicker and more receptive to a fertilised egg. Oestrogen peaks just before ovulation.