The direction of blood flow through the heart is best described by which of these?
a. Vena cava right atrium right ventricle lungs pulmonary artery left atrium left ventricle
b. Right atrium right ventricle pulmonary artery lungs pulmonary vein left atrium left ventricle
c. Aorta right atrium right ventricle lungs pulmonary vein left atrium left ventricle vena cava
d. Right atrium right ventricle pulmonary vein lungs pulmonary artery left atrium left ventricle
ANS: B
Returning blood from the body empties into the right atrium and flows into the right ventricle and then goes to the lungs through the pulmonary artery. The lungs oxygenate the blood, and it is then returned to the left atrium through the pulmonary vein. The blood goes from there to the left ventricle and then out to the body through the aorta.
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