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tonsil
small mass of lymphoid tissue in the mucus membrane o the pharynx that is the first line of defense from the external environment
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spleen
- located in the LUQ
- largest lymphatic organ in the body, filters blood for immune response
- removes and destroys old RBC
- has emergency storage of blood for hemorrhaging
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pathogens
microorganism capable of producing disease
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hemorrhage
loss of a large amounts of blood in a short period of time
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macrophage
phagocytic cell in the spleen
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thymus
endocrine gland which becomes smaller with age and plays an important role in immunity
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T lymphocytes, T cells
- originate in the bone marrow, mature in the thymus
- attack foreign agents such as viruses
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cytotoxic T cells, killer T cells
- secrete chemical compounds that destroy foreign cells (CA, viral, fungal)
- responsible for transplant rejection
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