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Describe the components of blood.
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1. Plasma–watery portion of blood; 55% of whole blood; primarily water; transports dissolved substances
2. Erythrocytes–red blood cells; enucleated biconcave disk; contain hemoglobin, a protein that transports oxygen
3. Leukocytes–white blood cells; remove bacteria, viruses, and cell debris; five types: eosinophil, lymphocyte, monocyte, basophil, neutrophil
4. Platelets–also called thrombocytes; trigger blood clotting process
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