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What is the lifespan of a red blood cell?

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A: According to the American Society of Hematology (ASH), the average life span of a red blood cell is 120 days. New cells form in bone marrow and take about seven days before they mature and enter the bloodstream. Red blood cells make up about 40 percent of blood's volume. read more

Red blood cells (RBCs), also called erythrocytes, are the most common type of blood cell and the vertebrate's principal means of delivering oxygen (O2) to the body tissues—via blood flow through the circulatory system.[1] RBCs take up oxygen in the lungs, or gills of fish, and release it into tissues while squeezing through the body's capillaries. read more

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