Pregnant Woman and Fetus Inside Womb: In only nine months, you and all the working parts of your body develop from one fertilized cell. Your cardiovascular system, comprised of the heart, blood, and vessels, is one of the first systems to form. Even an embryo, smaller than a pea, needs a cardiovascular system. The fetus is completely dependent on the mother for nutrients and waste disposal through the umbilical cord and placenta.
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