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Unformatted text preview: WBCs also help clean wounds. Some WBCs squeeze out of the blood vessels and move around in tissues, searching for pathogens (bacteria and viruses) 1 Other WBCs release antibodies. Antibodies are chemicals that identify or destroy pathogens. Platelets pieces of larger cells formed in the bone marrow. When a person bleeds, platelets begin to clump together in the damaged area. They form a plug that reduces blood loss. A blood clot is formed. Blood Types Every person has one of four blood types: A, B, AB, O Type O blood is called the universal donor. Everyone can receive Type O blood. Rh factor is involved in blood transfusions. Rh positive and Rh negative. Discovered in the Rhesus monkey. 2...
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- Fall '10