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What do red blood cells do for the blood?

Answer:
Red blood cells are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen (O2) to the body tissues via the blood flow through the circulatory system. They take up oxygen in the lungs or gills and release it while squeezing through the body's capillaries.
First answer by Johnsm080. Last edit by Garethfx. Contributor trust: 273 [recommend contributor recommended]. Question popularity: 2 [recommend question].

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