Define transportation in human beings
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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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If you were amazed by the beautiful roads that transport cars and bikes, then take a moment to see within yourself. There is this amazing network of blood vessels inside your body that covers a distance of an astonishing 100,000 km. These are responsible for the transportation of human beings. Let us take a closer look.
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