IMMUNOLOGY

Detailed explanation-1: -White blood cells protect your body against infection. As your white blood cells travel through your bloodstream and tissues, they locate the site of an infection and act as an army general to notify other white blood cells of their location to help defend your body from an attack of an unknown organism.

Detailed explanation-2: -So, the correct answer is ‘Platelet’

Detailed explanation-3: -All leukocytes are critical to body defense. There are normally between 5, 000-10, 000 leukocytes per cubic millimeter (mm3) of blood and these can be divided into five major types: neutrophils, basophils, eosinophils, monocytes, and lymphocytes.

Detailed explanation-4: -Innate immunity can be viewed as comprising four types of defensive barriers: anatomic (skin and mucous membrane), physiologic (temperature, low pH and chemical mediators), endocytic and phagocytic, and inflammatory. Table 1 summarizes the non-specific host-defense mechanisms for each of these barriers.