ANATOMY

Detailed explanation-1: -NeutrophilsThese cells primarily attack bacteria. They are dispensable, rather like pawns on a chessboard. They rush to the site of incoming bacteria to fight them, but are easily killed. Neutrophils only last a few days in the body (before they self-destruct), but our bone marrow produces more every day.

Detailed explanation-2: -The second line of defense is nonspecific resistance that destroys invaders in a generalized way without targeting specific individuals: Phagocytic cells ingest and destroy all microbes that pass into body tissues. For example macrophages are cells derived from monocytes (a type of white blood cell).

Detailed explanation-3: -These include neutrophils (PMNs), eosinophils, and basophils. Neutrophils are the leukocytes found in the largest numbers in the bloodstream and they primarily fight bacterial infections. Eosinophils target parasitic infections. Eosinophils and basophils are involved in allergic reactions.

Detailed explanation-4: -They kill and digest bacteria and fungi. They are the most numerous type of white blood cell and your first line of defense when infection strikes.

Detailed explanation-5: -Inflammation, fever, phagocytosis, interferon, and complement are all part of the second line defenses.