why does the blood need to flow on the different parts of the body??
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Blood is essential. In addition to carrying fresh oxygen from the lungs and nutrients to your body's tissues, it also takes the body's waste products, including carbon dioxide, away from the tissues.
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Every cell in our body needs oxygen and other nutrients to carry out it's functions. Blood acts as a medium to carry these essential items that makes the cell of various tissues alive that's why it needs to flow on to the different parts of the body.
Also the cells excrete their waste material into blood so that it can take it out of the body. Many harmones are also released in blood so that they could reach their target site.
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