Sharks have hearts with two chambers. Oxygenated blood travels from the gills to the atrium of the shark's heart. The heart pumps oxygenated blood into arteries to reach tissue and organs throughout the body. Deoxygenated blood travels through veins to the ventricle of the heart. The ventricle pumps deoxygenated blood to the gill capillaries. A shark's heart is not very strong - the flow of water helps move blood through the shark's circulatory system, so the heart does not provide all of the necessary force to keep blood flowing.

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