What is transportation? Explain transportation in humans.
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In humans, transportation of oxygen nutrients, hormone and other substances to tissue, CO2 to the lungs and waste products to the kidneys is carried out by a well-defined Circulatory System. In lower organisms material is transported by diffusion.
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The blood is responsible to transport food, oxygen, and waste materials in human bodies. Blood usually consists of a fluid medium known as plasma where the cells remain suspended. Plasma is responsible to transport food, carbon dioxide, and nitrogenous wastes in dissolved form.
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