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Left

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Left atrium , as left atrium carries oxygenated blood

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The Left side of the heart it has to pump blood further around the body, and against blood pressure compared with the right ventricle.

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Ventricle. It has to pump oxygenated blood which is more important

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Left ventricle. It has to pump blood to the the rest of the body while the right ventricle only has to pump it to the lungs

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It prevents the back flow of blood from the aorta to the left ventricle / pulmonary artery to the right ventricle

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It prevents the back flow of blood from the right ventricle to the right atrium when the left ventricle contracts.

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separate the atria from the ventricles on each side of the heart and prevent backflow of blood from the  ventricle into the atria during systole.

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the left ventricle because it has to pump the blood to the rest of the body

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it prevents the back flow of blood from the arteries to the ventricles