Question 5 — Explain why the menstrual cycle - Questions at the end of the chapter - Chapter 11 - Reproduction: How Life Continues (Exploration)

Last updated at July 3, 2026 by

Question 5
Explain why the menstrual cycle stops during pregnancy.
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  • During pregnancy, a zygote implants in the thick uterine lining, which is needed to nourish the embryo.
  • Since the lining is not shed and no new egg is prepared for release, menstruation stops until after the baby is born.
No Cycle in Pregnancy A zygote implants in the thick lining The lining nourishes the embryo So it is not shed → menstruation stops
Back to: 11.5.6 What happens when an egg is not fertilised?
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