CH. 27

CH. 27 - Chapter 27: Homeostasis & Organization of the...

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Chapter 27: Homeostasis & Organization of the Animal Body
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Homeostasis
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Feedback Systems
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Feedback Systems
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Negative Feedback Reverses the Effects of Changes
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Negative feedback above set point below control center thermometer (sensor) heater (effector) heat output increases heat output decreases hypothalamus (control center) skeletal muscles (effector) heat output (shivering) increases heat output (shivering) decreases nerve endings (sensor) on off signal (temperature) to control center signal to turn on effector signal to turn off effector nerve signal (temperature) to control center nerve signal to turn off effector nerve signal to turn on effector
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Negative Feedback Reverses the Effects of Changes
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Positive Feedback Drives Events to a Conclusion
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Positive feedback control center effector sensor output level increases hypothalamus (control center) uterine muscles (effector) stretch receptors in cervix (sensor) uterus output level (contraction) increases signal to control center signal to turn on effector nerve signal to control center oxytocin release (signal to turn on effector)
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The Body’s Internal Systems Act in Concert
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CH. 27 - Chapter 27: Homeostasis & Organization of the...

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