All of the options listed describe functions that are related to the placenta, but primarily, the placenta is known for nourishing the embryo. It facilitates the transfer of nutrients and oxygen from the mother to the developing fetus and removes waste products from the fetal blood.
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It protects the embryo: While the placenta does provide some level of protection, this is more about immunological functions and barrier properties rather than direct physical protection.
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It helps keep the embryo’s temperature constant: This is not a primary function of the placenta.
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It cushions the embryo from shock: This is mainly the role of the amniotic fluid and the surrounding tissues, although the placenta helps in creating a stable environment.
So, while the placenta contributes to aspects of protection and stability, its primary and most direct function from the options provided is that it nourishes the embryo.
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