Which specialized leukocyte type constitutes the largest percentage of white blood cells in normal human peripheral blood and functions as the primary phagocytic defense against acute bacterial infections?

💡 Solution & Explanation

Neutrophils are polymorphonuclear leukocytes that make up roughly 40 to 70 percent of circulating white blood cells and act as rapid responders to bacterial invasion through phagocytosis and the release of antimicrobial enzymes. Lymphocytes comprise T cells and B cells responsible for adaptive immunity rather than acute phagocytosis. Eosinophils specialize in combating parasitic infections and modulating allergic inflammatory responses. Basophils release histamine and heparin during hypersensitivity reactions, forming a minor fraction of the total leukocyte count.