IMMUNOLOGY

Detailed explanation-1: -The macrophages and neutrophils of the innate immune system provide a first line of defense against many common microorganisms and are essential for the control of common bacterial infections.

Detailed explanation-2: -The first cells to arrive, usually within an hour, are neutrophils and eosinophils, followed a few hours later by macrophages.

Detailed explanation-3: -Thus, neutrophils represent an important first-line defense against invading microbes. Basophils originate from bone marrow and circulate in the blood; they are the least abundant white blood cells. Upon activation by proteins, they move to an injured or infected site.

Detailed explanation-4: -Macrophages play a significant part in immunity and immune responses. They assume a defensive role exhibited by their ability to carry on phagocytosis of parasites and microbes.

Detailed explanation-5: -Neutrophils are typically the first cells to arrive at the site of an infection because there are so many of them in circulation at any given time. Eosinophils: Eosinophils are granulocytes target multicellular parasites.