Question 5
Which hormone rebuilds the uterine wall in the proliferative phase, and which brings it to a secretory state?
The right answer is the one marked above.
Oestrogen, then progesterone. Oestrogen grows the new layer of cells and its blood capillaries over about 10 days; progesterone then thickens it further and makes its glands active, over about 14.
FSH and LH act on the ovary, not on the uterine wall. Keep the two glands apart and the whole cycle is straightforward: the pituitary instructs, and the ovary replies with the hormones that reach the uterus.