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Anatomy & Physiology - PowerPoint PPT Presentation

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Anatomy & Physiology

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  1. Anatomy & Physiology Chapter 1.2

  2. 8 Necessary Life Functions • Maintaining Boundaries • Movement • Responsiveness • Digestion • Metabolism • Excretion • Reproduction • Growth

  3. 5 Survival Needs • Nutrients • Oxygen • Water • Body Temperature • Atmospheric Pressure

  4. Homeostasis • Dynamic state of equilibrium – not static • All homeostatic control mechanisms have these three components: • Receptor – receives stimuli • Control center – determines the appropriate response • Effector – response to stimuli

  5. Afferent Pathway • Pathway from receptor to the control center • Afferent – Approaches • Receptor receives stimulus • Sends information to the control center

  6. Efferent Pathway • Pathway from control center to the effector • Efferent – Exits • Control center sends information to respond to stimulus to the effector

  7. Negative Feedback • Most homeostatic control mechanisms are negative feedback systems • Cause a shut off of the original stimulus • Example: Hypothalamus and body temperature regulation

  8. Positive Feedback • Rare in the human body • Increase the original stimuli • Examples: Dilation during child birth