Question:
Where in the human body are red blood cells (RBCs) produced?
Where in the human body are red blood cells (RBCs) produced?
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Look inside the bones, this soft tissue makes blood cells.
Updated On: Jul 16, 2026
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Solution and Explanation
Correct answer: Bone marrow.
Red blood cells are made inside the bone marrow, mainly in the marrow of long bones like the femur and in flat bones such as the sternum and pelvis. This process is called erythropoiesis.
A hormone named erythropoietin, released by the kidneys, controls how fast new RBCs are made based on the body's oxygen needs.
Red blood cells are made inside the bone marrow, mainly in the marrow of long bones like the femur and in flat bones such as the sternum and pelvis. This process is called erythropoiesis.
A hormone named erythropoietin, released by the kidneys, controls how fast new RBCs are made based on the body's oxygen needs.
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