Extraembryonic Membrane & its Function

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4 Terms

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Amnion

  • Fluid-filled sac surrounding the embryo

  • Protects the embryo from desiccation and mechanical shock

2
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Yolk Sac

  • Allows for nutrient uptake and circulatory system development(early blood cell formation in mammals)

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Allantois

  • Storage of waste products (umbilical vessels in mammals)

4
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Chorion

  • Surrounds embryo and other membranes

  • Important in gas exchange between embryo and external environment (important in embryonic part of placenta in mammals)