What is the function of the chorion during embryonic development?

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The chorion plays a vital role in embryonic development, particularly in the context of gas exchange. It is one of the membranes that envelop the developing embryo in many vertebrates, including mammals. The chorion is involved in facilitating the exchange of gases – oxygen and carbon dioxide – between the embryo and the external environment.

In species that rely on placentation, the chorion forms part of the placenta, which is crucial for the embryo's development since it allows for efficient nutrient and gas transfer while also serving protective and waste management functions. The chorion's structure, which is vascularized and intimately associated with maternal tissues, enhances its effectiveness in this role.

Although other options mention functions such as storage of waste, provision of nutrients, and creation of amniotic fluid, these are not primarily associated with the chorion. For instance, while waste storage or nutrient provision can occur through the placenta involving other membranes, the chorion itself is specifically optimized for gas exchange, making it essential for the embryo's respiration and overall development.

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