Homeostasis

Created by: Stewie Griffin
Created on: 17-06-13 08:58

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Homeostasis
- Controls:
  - Temperature
  - Blood Glucose concentration
  - Blood salt concentration
  - Water potential of blood
  - Blood pressure
  - CO2 concentration
- Negative Feedback process
  - 1. Optimum condition(s)
    - 2. Change away from optimum
      - 3. Receptor detects change
        4. Communication system informs effector
        5. Effector acts to reverse change
        6. Return to optimum
        1. Optimum condition(s)
        2. Change away from optimum
        3. Receptor detects change
        4. Communication system informs effector
        5. Effector acts to reverse change
        6. Return to optimum
  - The reversal of a change in the internal environment to return to a stady state or optimum position
  - e.g. Being hot and cooling down
- Positive Feedback
  - 1. Reponse to increase original change
    - e.g. Being cold and getting colder
    - 2. Optimum condition
      - 2.1. Change away from optimum
        2.4. Receptor detects change
        2.3. Communication system informs effector
        2.2. Effector reacts to increase change
        2.1. Change away from optimum
        2.4. Receptor detects change
        2.3. Communication system informs effector
        2.2. Effector reacts to increase change
  - Good and bad
    - Good
      - Oxytocin productuion during childbirth
        Oxytocin released in uterus to cause contractions
        Contractions trigger release of more oxytocin
        Makes next contraction stronger
        process continues until cervix is fully dilated
    - Bad
      - 1. When cold enzyme activity slows
        2. Therefore less reactions take place
        3. Less reactions take place so become colder
        
        3. Less reactions take place so become colder

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Homeostasis

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