thinnest blood vessels - capillaries, top right chamber of heart - right atrium , blood goes to all parts of body from this chamber - left ventricle, exchange of gases happen here - lungs , they control the flow of blood in the heart - valves, these are carried by blood - Oxygen carbon dioxide water nutrients and waste, most arteries carry - oxygenated blood , most veins carry - deoxygenated blood , a pumping organ - heart , arteries branch into - arterioles,

Circulatory System

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