Question

During which days does the corpus luteum degenerate if fertilisation does not occur?

Options

• Day 5–13

• Day 15–20

• Day 21–28

• Day 1–5

Answer 1

If fertilisation does not occur, the corpus luteum degenerates during Day 21–28 of the menstrual cycle. This degeneration leads to a sharp drop in progesterone and estrogen levels, triggering the onset of menstruation.