BIOL 031 Lecture Notes - Lecture 19: B Cell, Heparin, Natural Killer Cell
18 Aug 2020
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Document Summary
Serum remaining liquid at top of blood sample (similar to plasma but lacks plasma proteins because they were used up in the formation of a clot) Colorless but appear colored in stained preparations. All the types constitute about 7000 mm/blood in comparison with 5 million erythrocytes. Fewer because they are in transport in the blood. Can exit blood vessel to the site of infection because amoeboid movement. Migrate to tissues for a few days. Granules contain toxic molecules that attack parasites. Contribute to tissue damage in allergic reactions. May defend against large parasites by releasing toxic substances. New monocytes circulate in blood few hours. Migrate to tissues and become macrophages: wandering macrophages, fixed macrophages. Three types: b lymphocytes (b cells) antibody production, t lymphocytes (t cells) cell mediated response, null cells natural killer cells; viral infections. Cell fragments: no nucleus, has organelles and granules. Leukocytosis a decrease in the number of white blood cells.
