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Life Sci 2 - Chapter 18

Life Sci 2 - Chapter 18 - James Chyu Cooper Spring `05...

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James Chyu Cooper, Spring ‘05 CHAPTER 18: NATURAL DEFENSES AGAINST DISEASE Animal Defense Systems - pathogens: harmful organisms and viruses that can cause disease - defense mechanisms 1. nonspecific defenses - inherited mechanisms that protect body from pathogens ex: skin 2. specific defenses - adaptive mechanisms aimed at specific target ex: antibody protein, DNA rearrangements, mutations Blood and lymph tissues play important roles in defense systems - lymphoid tissues: thymus, bone marrow, spleen, & lymph nodes, esp. blood & lymph - human lymphatic system...great another diagram...jus what we need one page into reading - lymph nodes: fluids are filtered and white blood cells mature - lymph ducts: conduct lymph - thymus: T cells mature in the thymus - spleen: lymphocytes accumulate and mature - bone marrow: B cells mature - blood plasma: yellowish solution containing ions, small molecular solutes, & soluble proteins - suspended in plasma are red blood cells, white blood cells, & platelets - red blood cells confined to closed circulatory system ex: heart, arteries, capillaries, & veins - white blood cells & platelets also found in lymph - lymph: fluid derived from blood & other tissues that accumlates in spaces in body - from spaces flows into vessles of lymphatic system & join together to form thoracic duct - lymph nodes: small, roundish structures along lymph vessles containing white blood cells White blood cells play many defensive roles - all red/white blood cells originate froms tem cells in bone marrow - white blood cells: nuclei & colorless, red blood cells lose nuclei in development - broad groups of white blood cells 1. phagocytes: engulf and digest nonself materials.
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