IMMUNOLOGY

Detailed explanation-1: -Macrophages. Macrophages are derived from monocytes and are found in the tissues. They have a major role as a first defence mechanism in phagocytosis of cellular debris, microbes and any other foreign substances.

Detailed explanation-2: -Answer and Explanation: The white blood cell that phagocytizes microorganisms and other substances is Neutrophil. Neutrophils are white blood cells known as granulocytes because they contain tiny cytoplasmic granules.

Detailed explanation-3: -Neutrophils comprise 50% to 70% of circulating leukocytes and represent the body’s initial line of defense. They are involved in the acute inflammatory response to bacterial infection and removal of the bacteria by phagocytosis. They are also the most numerous cells to arrive at the site of injury or infection.