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15 Cards in this Set
- Front
- Back
Physiology
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The study of life and living processes
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Homeostasis
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Process of maintaining a stable internal environment in the body or within a cell despite external changes
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What are some variables that are kept in homeostatic balance in the body?
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pH, body temperature, blood sugar, blood pressure, electrolytes
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Why must homeostasis be maintained?
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In order to maintain cellular shape and integrity and to keep proteins happy.
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What is feedback control?
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Feedback control is the means by which homeostasis is maintained. It is a stimulus-response mechanism.
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What does feedback control regulate?
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Feedback control regulates hormone secretion and neural reflexes.
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What is the step-by-step order of feedback control along the afferent pathway?
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1. Stimulus: change in variable
2. Receptor: detects change 3. Input: information sent along to control center. |
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What is the step-by-step order of feedback control along the efferent pathway?
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4. Output: information sent along to effector
5. Response of the effector: to reduce the effect of stimulus |
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What is negative feedback?
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Negative feedback is the most common type of feedback. It decreases the original stimulus.
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Variable
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Factor or event being regulated
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Receptor
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Sensor that monitors and responds to changes by Afferent pathway.
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What is the control center and what does it do?
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The control center could be the brain or cell with hormones. It determines level at which variable is to be maintained.
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What is positive feedback?
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Positive feedback is rare and the response increases or exaggerates the original stimulus. It can cause rapid change in a process.
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What are some examples of positive feedback?
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Labor and blood clotting
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Effector
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Provides the means for the control center to respond to stimulus.
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