We are kind of missing the semilunar valves but they are the crescent moon shaped flaps (one at the opening of the pulmonary artery and one at the ending of the aorta) that prevent back flow of blood.
Oxygenated blood moves in through the pulmonary vein, through the left ventricle and atrium, and out through the aorta.
Deoxygenated blood moves in through the inferior and superior vena cavas, through the right ventricle and atrium, and exits out the pulmonary artery.
Arteries take blood away from the heart, while veins return the blood to the heart.
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