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Menstrual cycles are absent during pregn...

Menstrual cycles are absent during pregnancy. Why?

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The high levels of progesterone and estrogens during pregnancy suppress the gonadotropins which is required for the development of new follicles. Therefore a new cycle cannot be intiated.
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OSWAAL PUBLICATION-HUMAN REPRODUCTION-TOPIC-2 (MENSTRUAL CYCLE,FERTILISATION AND PREGNANCY)(SHORT ANSWER TYPE QUESTIONS-I)
  1. List any four hormones secreted by placenta.

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  2. Name two gonadotropins.

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  3. Menstrual cycles are absent during pregnancy. Why?

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  4. Women experiences two major events in their life time one at menarche ...

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  5. Corpus luteum in pregnancy has a long life. However, if fertilisation ...

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  6. Placenta has endocrine function. Does it have other functions? Explain...

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  7. What are the events taking place in the ovary and uterus during follic...

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  8. Given below is a flow chart showing ovarian changes during menstrual c...

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  9. Differentiate between morula and blastocyst as stages in human embryon...

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  10. Name the hormone responsible for the descent of testes into the scrotu...

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  11. What is pregnancy hormone? Why is it so called? Name two sources of th...

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  12. (a) Name the foetal membrane that provides a fluid medium to the devel...

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  13. What structure forms the corpus luteum and at what stage? Name two hor...

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  14. Differentiate between the action of LH in males and females.

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  15. Mention the significance of fertilization.

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  16. What is fertilization membrane? How it is formed?

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  17. What is parturition ? Which hormones are involved in induction of part...

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  18. What is menstrual cycle? Which hormones regulate menstrual cycle?

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  19. Differentiate between menarche and menopause.

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  20. What is corpus luteum? Under what conditions does it undergo degenerat...

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