Red blood cells are produced in the:

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Red blood cells, or erythrocytes, are produced in the bone marrow, specifically in the spongy bone tissue of the long bones such as the femur and tibia. The bone marrow contains stem cells that can differentiate into either red or white blood cells, and erythrocytes are continuously produced to replace older cells that have reached the end of their lifespan. The thymus is responsible for the development of T cells, a type of white blood cell. The liver is involved in various metabolic processes but is not a site of blood cell production. The spleen filters old or damaged blood cells but does not produce new ones.

Red Blood Cells Are Produced in The