Question

question 3
1 pts
menstruation is triggered by a drop in the level of
human chorionic gonadotropin.
fsh.
lh.
estrogen and progesterone.
relaxin.
question 4
1 pts

Explanation:

Menstruation occurs when the lining of the uterus sheds. This is triggered by a drop in estrogen and progesterone levels. Estrogen and progesterone are hormones that help maintain the uterine lining. When their levels drop (if pregnancy does not occur), the lining can no longer be sustained, leading to menstruation. Human chorionic gonadotropin (hCG) is associated with pregnancy (produced by the placenta). FSH (follicle - stimulating hormone) and LH (luteinizing hormone) are involved in the regulation of the menstrual cycle (FSH helps in follicle development and LH in ovulation). Relaxin is a hormone involved in processes like softening the cervix and relaxing pelvic ligaments during pregnancy.

Answer:

estrogen and progesterone.