Explain the hormonal control of the menstrual cycle, including the roles of LH, FSH, and progesterone, and the consequences of their imbalance.

Progesterone, produced by the corpus luteum, is essential for maintaining the uterine lining (endometrium).

If the corpus luteum is defective and cannot produce enough progesterone, the uterine lining will not be adequately maintained.

This will prevent the successful implantation of the developing embryo or lead to the shedding of the uterine lining, resulting in the death of the embryo or an early miscarriage.

Question 3.1.4

LH and FSH (Follicle-Stimulating Hormone) are crucial for ovarian function, stimulating follicle development and the production of ovarian hormones (estrogen and progesterone).

If the pituitary gland does not release enough LH and FSH, the ovaries will not be stimulated to develop follicles or ovulate. This will lead to low levels of estrogen and progesterone being produced by the ovaries.

Estrogen and progesterone are responsible for the growth and maintenance of the uterine lining (endometrium). With insufficient levels of these hormones, the uterus will have a thin and underdeveloped endometrium, leading to irregular or absent menstrual periods (amenorrhea) and an inability to support a pregnancy.