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Red blood cells carry oxygen throughout the circulatory system, which allows the tissue cells to produce energy through aerobic respiration. The red blood cells pick up oxygen in the lungs and carry it through the arteries in the body to the tissues. When they reach the smallest vessels, capillaries, oxygen is easily dropped off and the cells make their way back to the heart and then into the lungs. They will continue this cycle for about 100-120 days. Because the body is always making new blood, it is safe, under most circumstances, to donate blood.

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