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Maintaining Life

Maintaining Life. pp. 7-11. Survival Needs. Nutrients Oxygen Water Normal body temperature Atmospheric pressure. Necessary Life Functions. Maintaining boundaries Movement Responsiveness (irritability) Digestion Metabolism Excretion Reproduction Growth. Cooperation of Organ Systems.

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Maintaining Life

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  1. Maintaining Life pp. 7-11

  2. Survival Needs • Nutrients • Oxygen • Water • Normal body temperature • Atmospheric pressure

  3. Necessary Life Functions • Maintaining boundaries • Movement • Responsiveness (irritability) • Digestion • Metabolism • Excretion • Reproduction • Growth

  4. Cooperation of Organ Systems

  5. Homeostasis • Definition? • DYNAMIC state of equilibrium • Requires communication

  6. Homeostatic Mechanisms

  7. Negative Feedback • Reduces deviation from set point • Effectors shut down • Examples? • Animation

  8. Positive Feedback • Increases deviation from set point • Effectors accelerate to unstable conditions • Examples?

  9. Homeostatic Imbalance • Disease condition • Example: diabetes

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