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What Do Red Blood Cells Do? Red blood cells carry oxygen and nutrients to the tissues within the physique and take away carbon dioxide. They're additionally called erythrocytes. They get their red colour from a pigment called hemoglobin, and it's the hemoglobin that actually carries the oxygen and carbon dioxide. Red blood cells are made in the bone marrow. A crimson blood cell begins as a spherical cell with a spherical nucleus, and as this cell grows contained in the bone marrow, it picks up hemoglobin. Finally, when the crimson blood cell is mature, it sheds the nucleus, leaves the marrow and enters the bloodstream. The lack of a nucleus is one factor that makes a crimson blood cell completely different from other mature cells. It has an indented middle and is ready to deform itself enough to squeeze through capillaries. A red blood cell is lively for about four months. After this time, it leaves the circulatory system and the physique destroys it within the spleen, liver, bone marrow and blood vessels. To replace these destroyed cells, the body has to create about two million purple blood cells each second. Every cubic millimeter of a man’s blood accommodates about 5.2 million red blood cells. The corresponding rely for ladies is about 4.6 million.
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