Question Detail
Question
The following statements are related to menstruation. Which ones are correct? I. Estrogen levels drop II. Progesterone levels drop III. Inhibin levels increase IV. Follicle stimulating hormone and luteinizing hormone no longer inhibited V. Corpus luteum secretes progesterone. a. II, IV, V b. I, III, V c. I, II, IV d. I, IV, V
Correct Answer
Option C is the correct answer.
Detailed Explanation
Menstruation is triggered by a sharp drop in both estrogen (I) and progesterone (II) levels due to the degeneration of the corpus luteum (so V is false, it stops secreting). This drop removes the negative feedback inhibition on the pituitary, so FSH and LH levels begin to rise again (IV is correct). Inhibin levels do not increase at this time.
Hint
Two hormones plummet, and that allows the cycle-starting hormones to rise again.