AAMA CMA Practice Question

White blood cells are a diverse group of leukocytes that patrol the bloodstream and tissues, recognizing, attacking, and removing invading microorganisms or other foreign material. This immune defense role is their chief function. Red blood cells are specialized for gas transport, carrying oxygen to tissues and carbon dioxide back to the lungs. Platelets are cell fragments that aggregate and trigger the coagulation cascade to form clots and stop bleeding. Plasma proteins such as albumin exert colloid osmotic pressure to keep fluid in the vascular compartment and help buffer blood pH. Because only one option accurately identifies leukocyte function, it is the correct choice.