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18 Cards in this Set
- Front
- Back
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HOMEOSTASIS |
Regulation of organisms internal environment to maintain equilibrium |
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Stimulus>Receptor>Control Center>Effector>variable (regulation)>back to stimulus |
Homeostatic control cycle |
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STIMULUS |
Produce a change to a variable |
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VARIABLE |
Factor being regulated |
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RECEPTOR |
Detects change, responds to stimuli, monitors environment |
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INPUT |
Information travels along the (afferent) pathway to the control center. Control center determines the appropriate actions and responses |
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AFFERENT |
To the brain |
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EFFERENT |
From the brain |
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OUTPUT |
Information sent from the control center travels down the (efferent) pathway to the effector |
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TARGET |
Any organ, tissue, cell that changes it's level of activity in response to a message |
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FEEDBACK MECHANISM |
Information from sensors that allow control center to compare current condition to ideal values |
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POSITIVE and NEGATIVE |
2 types of feedback mech |
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NEGATIVE FEEDBACK |
Counteracts change in the body that moves conditions above/below a set point. Inhibits the original stimuli (lessens) |
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POSITIVE FEEDBACK |
The output enhances original stimuli |
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NEGATIVE |
Positive/Negative: Photosynthesis: speeds up in response to increasing levels of CO₂ (therefore making O₂) |
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Positive |
Positive/Negative Oxytocin levels in pregnancy |
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Positive |
Positive/Negative Apple ripening: releases ethylene plant hormones |
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Negative |
Positive/Negative Carbonation: rain and CO₂ combine w/ limestone to make Calcium Bicarbonate (Ca(HCO₃)₂) |
