Homeostasis - PowerPoint PPT Presentation

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Homeostasis

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Homeostasis Positive and negative feedback Negative feedback Negative feedback: Cancels or counteracts original stimulus RECEPTOR (e.g., skin thermoreceptors ... – PowerPoint PPT presentation

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Title: Homeostasis


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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