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4 Cards in this Set
- Front
- Back
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Immune System |
Final line of defense against invading microorganisms, harmful chemicals, and foreign bodies Most immune system cells originate in the hematologic system Study of immune system (Immunology) and study of allergies often go hand in hand - allergic response is an immune response |
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Two kinds of immune cells |
1. B cells 2. T cells |
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Five types of WBCs |
1. Neutrophils - most abundant (60 - 70%) destroy bacteria - main defense 2. Eosinophils - (2 - 4%) protect against allergic reactions and parasites Low count is normal Secretes chemicals that weaken/destroy parasites 3. Basophils - rarest (less than .5%) Secrete histamine (vasodilator) & heparin (anticoagulant) Secrete chemicals that attract eosinophils and neutrophils 4. Lymphocytes - (25 - 33%) protection from viral affections such as measles, rubella, chicken pox, infectious mononucleosis Secrete antibodies; destroy cancer cells and foreign cells 5. Monocytes - (3 - 8%) second line of defense against infection Viral and inflammation (monocytes transform into macrophages - highly phagocytic cells) |
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Antibodies |
Immune system related proteins called immunoglobulins : Some destroy antigens directly, some indirectly by making it easier for WBCs to destroy antigen |
