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Chapter 5 Diseases_Pathogenic Organisms

Chapter 5 Diseases_Pathogenic Organisms - Disease Any...

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1 Chapter 5 Disease & Disease-Producing Organisms Disease Any disruption in the structure and/or function of a part, organ or system in the human body Causes may be known or unknown Symptoms may be objective or subjective Severity may be variable Classification of Diseases By Organ or organ system e.g. heart disease, kidney disease, respiratory infection Causative agent biological, chemical , and physical agents Type: acute vs. chronic vs. sub-acute diseases By Type of Disease Acute Diseases : Rapid onset, short duration, relatively severe Communicable common cold, pneumonia, measles, typhoid fever Noncommunicable appendicitis, poisoning, fire, gunshots Subacute Diseases : Between acute & chronic Neither severe nor very long-lasting Chronic Diseases: Less sever but continuous or recurring for long periods Communicable AIDS, TB, syphilis Noncommunicable diabetes, coronary heart disease, arthritis, liver cirrhosis Causative Agents of Disease Biological Agents Chemical Agents Physical Agents Viruses (e.g. Herpes, AIDS) Pesticides Heat Bacteria (e.g. Salmonellosis ) Food additives UV Light Fungi (e.g. Athlete’s foot) Drugs Radiation Protozoa (e.g. Malaria) Industrial chemicals Noise vibration Nematodes (e.g. Ascaris, elephantiasis) Air pollutants Cigarette smoke Car accidents Categories of Disease Infectious diseases : e.g. colds, AIDS, TB Degenerative diseases : e.g. osteoporosis, arthritis Nutritional disorders : e.g. rickets, nutritional anemias Metabolic disorders : e.g. diabetes Immune disorders : e.g. allergies autoimmune disorders: e.g. rheumatoid arthritis (RA), multiple sclerosis (MS) Psychiatric/mental disorders Neoplasms
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