The amnion provides a diffusion area for the amniotic fluid.

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The amnion is a thin membrane that lines the inner surface of the uterus and surrounds the developing embryo. It is composed of two layers of cells, the inner layer of which is called the amniotic epithelium. The amniotic epithelium is responsible for producing the amniotic fluid, which fills the amniotic cavity and provides a protective environment for the developing embryo. The amnion also provides a diffusion area for the amniotic fluid, allowing nutrients and oxygen to pass from the mother's blood into the amniotic fluid and waste products to pass from the amniotic fluid into the mother's blood.

The Amnion Provides a Diffusion Area for the Amniotic Fluid