how blood is formed..
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In the human adult, the bone marrow produces all of the red blood cells, 60–70 percent of the white cells (i.e., the granulocytes), and all of the platelets. The lymphatic tissues, particularly the thymus, the spleen, and the lymph nodes, produce the lymphocytes
comprising 20–30 percent of the white cells
comprising 20–30 percent of the white cells
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Answer: Blood cells are made in the bone marrow. It contains young parent cells called stem cells. These blood forming stem cells can grow into all 3 types of blood cells, red cells, white cells and platelets. These blood forming stem cells make copies of themselves, and they also produce mature blood cells.
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