immune system chp. 16 (pp. 323-350) ~20,000 genes affect immunity, usually polygenic or...
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Function of the system The immune system is the system of specialized cells and organs that protect an organism from outside biological influences Defends against pathogens and diseaseTRANSCRIPT
Immune system Chp. 16 (pp. 323-350)
~20,000 genes affect immunity, usually polygenic or multifactorial traits
Major Structures-• Lymphocyte (produce by spleen) - one kind of white blood cell - T-cell and B-cell • Lymph vessels• Lymph nodes • White blood cells• Spleen • Skin
Function of the system
• The immune system is the system of specialized cells and organs that protect an organism from outside biological influences
• Defends against pathogens and disease
– Cell surfaces used to recognize “foreign” or “nonself” surfaces
• initiate immune response– Autoimmune- immune system attacks individuals
own tissues or organs– Genes encode for
• antibodies are proteins which attack foreign molecules• cytokines are biochemicals which attack foreign
molecules– antigens molecules that cause an immune
response
•Spleen-Store blood
-Kill old RBC
-Produce lymphocyte
• AIDS HIV (human immunodeficiency virus)
infection will lead to immune system collapse
• HIV usually invades helper T cell, which begin to produce HIV soon after infection.
• Helper T cell die, the– immune system gradually weakens – becomes overwhelmed by pathogens that
would normally detect and destroy.
Diseases associated with that system
• Graves’ disease• Multiple sclerosis • Rheumatoid arthritis• Systemic lupus erythematosus (SLE) - facial skin rash, painful joints, fever,
fatigue, kidney problem, weight loss• Type I diabetes
One interesting fact
• Allergy is the body’s overreaction to a normally harmless antigen
• Allergy- causing antigens include pollen, spores, foods, drugs, and dust mites.
Allergies are caused by our immune system protecting us too much!!!!!!!!!