NATS 1670 Lecture Notes - Lecture 9: Clostridium, Neutrophil, Phagocyte
2 Dec 2017
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Document Summary
Basic concepts in immunology: defence from infectious disease. This is not normal and can be deadly because it releases toxins that harm the gastrointestinal tract. Phagocytes are produced throughout life in the bone marrow. They are stored there before being distributed around the body in the blood. They are scavengers, removing any dead cells as well as invasive microorganisms. Neutrophils are a kind of phagocyte and form about 60% of the white cells in the blood. They travel throughout the body, often leaving the blood by squeezing through the walls of capillaries to patrol" the tissues. During an infection, neutrophils are released in large numbers from their stores, but they are short-lived cells. Macrophages are also phagocytes but are larger than neutrophils and tend to be found in organs such as the lungs, liver, spleen, kidney and lymph nodes, rather than remaining in the blood.
