Maintaining Life

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Maintaining Life Homeostasis Notes
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Necessary Life Functions

• MAINTAINING BOUNDARIES inside stays distinct
  from outside
• MOVEMENT change in body position transport
  material inside body
• RESPONSIVENESS ability to sense change in
  environment react

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• DIGESTION process of breaking down ingested
  food
• METABOLISM sum of all chemical reactions
  occurring in body
• EXCRETION process of removing waste

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• REPRODUCTION producing offspring
• GROWTH increase in size

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Survival Needs

• NUTRIENTS contains chemicals for energy
• OXYGEN needed to release energy
• WATER required for metabolism stable body
  temperature

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• STABLE BODY TEMPERATURE - needed for metabolism
• ATMOSPHERIC PRESSURE force exerted by weight of
  air allows for exchange of gases

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Homeostasis

• bodys ability to maintain relative stable
  internal conditions
• HOMEOSTATIC IMBALANCE inability to maintain
  homeostasis cause of illness, disease, or aging

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Homeostasis Control Mechanism (Feedback Loop)

• RECEPTER sensor that detects change relays
  information to control center
• CONTROL CENTER determines set point analyze
  information received by receptor, then determines
  appropriate response

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• EFFECTOR receive information from control
  center produce a response
• 2 Types
• NEGATIVE FEEDBACK MECHANISM - decrease original
  stimulus

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• POSITIVE increase original stimulus