True, The human heart has four chambers., Arteries carry blood away from the heart., Capillaries allow the exchange of substances between blood and body tissues., The pulmonary artery carries blood from the heart to the lungs., The heart is a muscular organ that pumps blood., The left ventricle pumps oxygen-rich blood to the body., False, Heart valves allow blood to flow backward., The right ventricle pumps blood to the body., Veins carry blood away from the heart., The atria are the lower chambers of the heart.

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