Question 13 of 48

Birth control pills contain synthetic estrogen and progesterone. How might these hormones prevent pregnancy?

1. They cause the corpus luteum to degenerate.

2. They keep the pituitary from secreting FSH and LH, so ovulation does not occur.

3. They cause the lining of the uterus to be sloughed off.

4 They trigger premature ovulation, before an egg is mature.