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Excretory Products and their Elimination
Question
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Which is regarded as the urinary bladder of the embryo?

  • Amnion

  • Allantois

  • Chorion

  • Yolk sac

Answer

B.

Allantois

Allantois is an extraembryonic membrane developed as an outgrowth from hindgut. In the eggs of reptiles and birds, it functions as a urinary bladder and stores the waste excretory products. It also provides oxygen (in reptiles, birds and mammals) and food (in mammals) to the embryo.

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