the need for communication

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  • the need for communication
    • the environment
      • when the external environm. changes it places stress on the organism
      • the organism must monitor the changes and then it must changes its behavious an ohysiology to reduce stress
      • the environm. change is a stimulus and the changes in the environment is the response
      • internal environment
        • when cells undego various metabolic processes the use up substrates and produce products
        • these products can be toxic and a build up of these waste products act as a stimulus for their removal
        • a build up of toxins could alter the pH
        • a response could include a stimulus on the cell wall
      • all living things need to maintain a certain limited set of conditions inside their cells.
        • this is because cellular activities rely on the action of enzymes
    • a  good communication system
      • covers whole body
      • cells communicate with each other
      • enables specific communic.
      • is rapid
      • can be short or long term
    • negative feedback
      • a process that brings about a reversal of any change in conditions
      • a process that brings about a reversal of any chnage away from optimum conditions
      • it ensures an optimum steady internal state can be maintained
      • change away from optimum, receptor detects change, system informs effector, effector reacts to reverse change, return to optimum
    • positive feedback
      • a process that increases any change detected by the receptors.
      • the change tends to be harmful and does not lead to homeostasis
      • change away from optimum, receptor detects change, system informs effector, effector reacts to increase change

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