Question

Why does the level of fsh decrease and remain at a relatively low level during days 15-28 of the cycle?

Answer 1

FSH levels decrease during days 15-28 of the menstrual cycle due to the negative feedback effects of progesterone, produced by the corpus luteum, which prevents the development of new follicles and prepares the uterus for a potential pregnancy.

Step-by-step explanation:

The level of follicle-stimulating hormone (FSH) decreases and remains low during days 15-28 of the menstrual cycle because after ovulation, the luteal phase begins. During this phase, the ruptured follicle transforms into the corpus luteum, which secretes progesterone and some estrogen. Progesterone has a negative feedback effect on the pituitary gland, inhibiting the release of further FSH and luteinizing hormone (LH). The decrease in FSH prevents the development of new follicles while the corpus luteum is active. As progesterone prepares the uterine lining for potential pregnancy, it simultaneously suppresses further ovarian follicle development.

During days 15-28 of the menstrual cycle, the level of FSH (follicle-stimulating hormone) decreases and remains relatively low. This is due to the negative feedback mechanism of hormones in the body. Just prior to the middle of the cycle, high levels of estrogen cause FSH and LH (luteinizing hormone) to rise rapidly and then fall, leading to ovulation. After ovulation, progesterone and estrogen levels increase, inhibiting the release of further FSH and LH. This prevents any further eggs and follicles from developing, leading to a decrease in FSH levels.

Answer 2

The FSH will decrease and remain at a low level during the 15-28 days of the cycle because at this stage, the egg is waiting to be fertilized. The FSH needs to be low to prepare the uterus lining in case the egg will be fertilized.