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Explain why the menstrual cycle stops during pregnancy.

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Question

Explain why the menstrual cycle stops during pregnancy.

Explain
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Solution

During pregnancy, the embryo develops in the uterus and the thick uterine lining is needed to nourish and protect it. Hormones, especially progesterone, maintain this lining and prevent ovulation and its breakdown. Therefore no menstruation occurs during pregnancy.

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Chapter 11: Reproduction: How Life Continues - Revise, Reflect, Refine [Page 225]

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NCERT Science Exploration [English] Class 9
Chapter 11 Reproduction: How Life Continues
Revise, Reflect, Refine | Q 5. | Page 225
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