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It's probably not a coincidence that the percentage of water in each of us is almost the same as that on the Earth's surface. Water is a vital part of keeping the human body working properly, and it does so with the help of specialized body fluids, which act as lubricants and waste removal mechanisms and carry out other important roles. Just like rivers and seas, bodies function because of this complicated network of microorganisms, matter, and liquids performing millions of tasks every day.

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1. Blood

With a break down of approximately 45 percent cells and 55 percent plasma, blood is about 92 percent water. It's responsible for transporting nutrients and oxygen to, and taking waste from, cells. The most abundant protein in the blood is albumin, which pulls water into the circulatory system. Hemoglobin is another vital blood protein that contains iron, which delivers oxygen with the help of red blood cells. While iron levels vary, persistent low iron may be a sign of anemia.

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