An adult human's red blood cells are formed in the

Name: An adult human's red blood cells are formed in the
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Red blood cells, or erythrocytes, are produced in the bone marrow, specifically in the central long bones (such as the femur and humerus) and the pelvic bones. The spleen and liver do not have a significant role in the formation of red blood cells. The thoracic cavity contains the heart and lungs, and is not involved in red blood cell production.

An Adult Human's Red Blood Cells Are Formed in the