Trace a drop of blood through the fetal circulation using the structures provided
_____ Aorta
_____ Ductus arteriosus
_____ Ductus venosus
_____ Foramen ovale
_____ Head and extremities
_____ Left ventricle
_____ Right atrium
_____ Superior vena cava
ANS:
5, 8, 1, 3, 6, 4, 2, 7
Blood travels through the fetus in a unique pattern. Most blood enters the inferior vena cava through the ductus venosus, empties into the right atrium, and passes through the foramen ovale into the left atrium. It then travels to the left ventricle, into the aorta, and out into the rest of the systemic circulation. Blood returns to the heart from the head through the superior vena cava, goes through the right side of the heart before entering the pulmonary artery, or bypasses the lungs and enters the aorta through the ductus arteriosus.
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