Blood is made in the Bone Marrow. Blood cells are divided into three groups: the red blood cells (erythrocytes), the white blood cells (leukocytes), and the blood platelets (thrombocytes). All of the cells in the blood are made in the bone marrow. This happens primarily in the flat bones in your body such as the skull, the sternum, and the pelvis.
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Blood is made in the Bone Marrow. Blood cells are divided into three groups: the red blood cells (erythrocytes), the white blood cells (leukocytes), and the blood platelets (thrombocytes). All of the cells in the blood are made in the bone marrow. This happens primarily in the flat bones in your body such as the skull, the sternum, and the pelvis.