Chapter 43 Notes (Immune System)

Chapter 43 Notes (Immune System) - IMMUNE SYSTEM ORGANS...

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IMMUNE SYSTEM ORGANS •  LYMPH NODES- •  SPLEEN- stores blood cells; removes antibody coated cells •  ADENOIDS (TONSILS)- trap bacteria/antigens •  BONE MARROW- stem cells make blood cells; B lymphocytes mature here •  THYMUS- produce and “educate” T lymphocytes  NON SPECIFIC INNATE IMMUNITY - born with ability; treats all pathogens same 1. FIRST LINE OF DEFENSE = EXTERNAL           ~   SKIN - epithelial tissues; flat with tight junctions protective barrier           ~  MUCOUS MEMBRANES - mucous; mouth, nose, anus openings           ~  CILIA  line respiratory tract to sweep out invaders           ~  MUCUS  traps invaders           ~  SECRETIONS •  SEBACEOUS (OIL) GLANDS – SEBUM trap dust/particles SWEAT GLANDS – pH 3-5; acidity is antibacterial                 •  HYDROCHLORIC ACID  in stomach (pH 2) kills most germs in food                 •  LYSOZYME-  enzyme in  SALIVA/TEARS  that digests bacterial cell walls 2. SECOND LINE OF DEFENSE – INTERNAL LEUKOCYTES (PHAGOCYTIC CELLS)             also destroy any damaged WBC/tissue = PUS                ~  NEUTROPHILS- 60-70% major eaters ~ MACROPHAGES –“ BIG” phagocytic cells ~ EOSINOPHILS- increase with infection by multicellular parasites; too big to eat;                          attach and release chemicals to kill parasites
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This note was uploaded on 02/11/2012 for the course ZOOLOGY 152 taught by Professor Stephengammie during the Fall '11 term at University of Wisconsin.

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Chapter 43 Notes (Immune System) - IMMUNE SYSTEM ORGANS...

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