Which option correctly identifies a set of the main sites of hematopoiesis in adults?

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Multiple Choice

Which option correctly identifies a set of the main sites of hematopoiesis in adults?

Hematopoiesis in adults happens in red bone marrow within certain bones of the axial skeleton and at the ends of long bones. The main sites are the ribs, sternum, skull, vertebrae, pelvis, and the proximal ends of the femur and humerus. These marrow-rich areas provide the niche where hematopoietic stem cells mature into red cells, white cells, and platelets. The brain and heart do not produce blood cells, and the lungs and liver are not normal hematopoietic sites in healthy adults (the liver is a fetal site and may be involved only in disease).

Hematopoiesis in adults happens in red bone marrow within certain bones of the axial skeleton and at the ends of long bones. The main sites are the ribs, sternum, skull, vertebrae, pelvis, and the proximal ends of the femur and humerus. These marrow-rich areas provide the niche where hematopoietic stem cells mature into red cells, white cells, and platelets. The brain and heart do not produce blood cells, and the lungs and liver are not normal hematopoietic sites in healthy adults (the liver is a fetal site and may be involved only in disease).

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