HomeostasisNegativefeedback

HomeostasisNegativefeedback - HOMEOSTASIS and NEGATIVE...

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HOMEOSTASIS and NEGATIVE FEEDBACK
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HOMEOSTASIS Dynamic constancy of the internal environment It is set at a “normal value” ( set point ) Has 3 components : 1. Receptor (sensor) 2. Control Center 3. Effector
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Receptor Sensor Detects changes( disturbance) in internal or external environment Activates the homeostatic process to begin
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Control Center Receives information from the receptor Processes the information and directs appropriate response
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Effector Induces changes to correct disturbance
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Feedback Circuits It is a circuit (loop) because the ultimate change induced by the effector (the response) also becomes the next stimulus for the sensor Also called feedback loop
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Stimulus > Sensor(receptor) > Integrating (control) center > Effector > Response Response becomes the stimulus Example : - Set body temp is 37 o C - If you become cold, you initiate behavioral and physiological responses - Raise in temperature results - The cycle starts again if the body begins to overheat
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Homeostasis depends on feedback circuits I. Negative Feedback II. Positive Feedback
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Negative Feedback A change which triggers the control mechanism to counteract further change
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HomeostasisNegativefeedback - HOMEOSTASIS and NEGATIVE...

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