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Homeostasis

Homeostasis. Positive and negative feedback. Negative feedback. Negative feedback: . Cancels or counteracts original stimulus RECEPTOR (e.g., skin thermoreceptors) Registers that body is too hot INPUT (sensory neuron impulse to the Integrator) INTEGRATOR (brain --- hypothalamus)

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Homeostasis

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  1. Homeostasis Positive and negative feedback

  2. Negative feedback

  3. Negative feedback: Cancels or counteracts original stimulus • RECEPTOR (e.g., skin thermoreceptors) Registers that body is too hot • INPUT (sensory neuron impulse to the Integrator) • INTEGRATOR (brain --- hypothalamus) • OUTPUT (motor neuron impulse to the Effector) • EFFECTOR (sweat glands)

  4. Positive feedback

  5. Positive feedback • increases original stimulus

  6. In positive feedback • A change is detected by receptors • Information is transmitted to control center. • Control center activates effectors • Effectors generate a response which increases the stimulus • Thus, positive feedback acts to reinforce or strengthen the stimulus or change.

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