| http://www.w3.org/ns/prov#value | - Plasma is approximately 90% water and comprises approximately 55% of total blood volume. ??? ??? ??? Erythrocytes red blood cells that carry oxygen, develop in bone marrow. ??? ??? ??? Leukocytes white blood cells that combat infection and respond to inflammation; there are five types of white blood cells. ??? ??? ??? Platelets (thrombocytes) one of the formed elements in the blood that is respons
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