The blood, pumped by the heart, travels all around the body in blood vessels. It leaves the heart in arteries and returns in veins. Valves, present in the heart and veins, ensure a one-way flow for the blood. As blood enters an organ, the arteries divide into smaller arterioles, which supply capillaries. In these vessels the blood moves much more slowly, allowing the exchange of materials such as oxygen and glucose, carbon dioxide, and other wastes. Blood leaving an organ is collected in venules, which transfer it on to larger veins.
View complete notes on the topic "Transport in animals" from the PDF file below.
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