List the three types of formed elements.

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Formed elements are the cellular components of blood, not the plasma. The three types are red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Red blood cells transport oxygen and carbon dioxide, white blood cells defend against pathogens, and platelets help stop bleeding by forming clots. Any list that includes red blood cells, white blood cells, and platelets communicates the complete trio, and the order doesn’t affect their identity or function.