The mass of tissue that allows nutrients and oxygen to pass from the mother's blood to the baby's blood is called the

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The placenta is a flat, circular organ that develops in the uterus during pregnancy. It allows nutrients and oxygen to pass from the mother's blood into the baby's blood, and waste products to pass out of the baby's blood back into the mother's blood for elimination. The cervix is the lower part of the uterus that extends into the vagina, and the vagina is the muscular tube that connects the uterus to the outside of the body. While both of these structures are important in pregnancy and childbirth, they are not responsible for nutrient and oxygen exchange between mother and baby.

The Mass of Tissue That Allows Nutrients and Oxygen to Pass