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When and where do chorionic villi appear...

When and where do chorionic villi appear in humans ? State their function.

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Chorionic villi arise from the surface of blastocyst during placentation. These fit into crypts of endometrium of uterus. Finally chorionic villi and uterine mucosa form true placenta which helps in nutrition, respiration and excretion of embryo and also maintains pregnancy.
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MODERN PUBLICATION-HUMAN REPRODUCTION-REVISION EXERCISES (SHORT ANSWER TYPE QUESTION (B)QUESTIONS FROM CBSE EXAMINATIONS)
  1. name the hormone responsible for the descent of testes into the...

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  2. Write two differences between spermtogenesis and oogenesis

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  3. Differentiate between morula and blastula of mammals.

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  4. Where are Leydig's cells located ? Name their hormonal secretions. Whi...

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  5. What structure forms the corpus luteum and at what stage ? Name...

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  6. Describe the functions of humans placenta .

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  7. Draw a diagrammatic sketch of the microscopic view of a mammalian sper...

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  8. Draw a labelled diagram of a part of T.S. through seminiferous tubule ...

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  9. Given below is an incomplete flow chart showing influence of hormones ...

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  10. Where are fimbrae present in human female reproducative system ?...

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  11. Name the muscular and glandular layers of human uterus. Which one of t...

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  12. Where are the Leydig cells present ? What is their role in reprodu...

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  13. Placenta acts as an endocrine tissue. Justify.

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  14. Differentiate between menarche and menopause.

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  15. Differentiate between major structural changes in the human ovary duri...

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  16. (a) Where do the signals for parturition originate from in humans? ...

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  17. When and where do chorionic villi appear in humans ? State their funct...

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  18. Explain the significance of meiocytes in a diploid organism.

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