Chapter 11- Health and Disease 0.0 / 5 ? BiologyHealth, illness and diseaseASAQA Created by: zorrorulesCreated on: 15-04-15 11:15 Health Physical, mental and social welbeing you are in good health if you are: Free from disease Well fed Well intergrated in society Have proper sanitation Have a positive outlook 1 of 6 Disease A departure from good health - malfunction of the body or mind Causes physical, mental or social problems Diseases caused by living organisms are called INFECTIOUS Normal physical but can effect social and mental wellbeing as well. Types of disease Bacteria Fungi Virus Protoctista 2 of 6 Parasites + Pathogens Organisms that live on or in a living organism (the host) Can live externaly Can live internaly Causes harm to the host - taking nutrients Can go unnoticed but can cause major issues if thrive in the enviroment = secondary infections Pathogens Organisms that cause disease by taking nutrition from their host but cause damage in the process 3 of 6 Malaria Anopheles (female mosquitos) are vectors Plasmodium is the most widespread cause of Malaria - eukaryotic organism Anopheles feed on blood - adapted tubes to take in blood from blood vessels If host has Malaria the mosquito sucks the parasite gamates into stomach -develop in to zygotes then move the the salviary glands Mosquito then bites another person and infected salvia is transmitted - gamates then produced in the red blood cells of the infected Plasmodium can be transmitted by unhygenic medical practise, unscreened blood transfusions also can move along the placenta to unborn child. 4 of 6 HIV/AIDS Caused by the human immodeficiency virus (HIV) Enters the body and remains inactive = HIV positive It attacks and destroys the T helper cells in immune system - meaning ability to resist infection is reduced Unable to defend ourselves from any pathogens- contract infections AIDS - Aquried immune deficiency syndrome - result of HIV Transmitted by: exchange of body fluids Unprotected sex Unscreened blood transfusions Unstyrlised medical equipment Hypodermic needles Breast feeding 5 of 6 Tuberculosis (TB) Caused by mycobacterium tuberculosis and M.bovis Usally found in the lungs Spread by: Overcrowding Poor ventiliation Poor health Homelessness Poor diet 6 of 6
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