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The correct answer is a. White blood cells are involved in both responses. In the hormone response, platelet cells form a platelet plug, which temporarily plugs the injury until prothrombin is converted to thrombin, which then triggers the conversion of Fibrinogen to Fibrin, which forms a Fibrin clot at the site of the injury. As for the antiinflammatory response, phagocytic leukocytes (eosinophils and monocytes) are released to engulf the bacteria surrounding the injury. Red blood cells are involved in oxygen regulation inside tissues. Beta and alpha islet cells are found in the pancreas and they involve the regulation of glucose levels in the blood.
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