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| (homeo, unchanging + stasis, standing) refers to the existence of a stable internal environment. |
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| is the adjustment of physiological systems to preserve homeostasis. Understanding of homeostasis is crucial to predicting the body's responses to normal and abnormal conditions. |
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| autoregulation (or intrinsic regulation) |
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Definition
| occurs when a system adjusts its activities automatically in response to environmental changes. |
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| results from the activities of the nervous or endocrine system. These two systems control or adjust the activities of many other systems simultaneously. |
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| endocrine system releases chemical messengers called: |
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| a homeostatic regulatory mechanism consists of three parts: |
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Definition
| receptor, control center and effector. |
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| what does the receptor do? |
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Definition
| it is a sensor that is sensitive to a particular environmental change or stimulus. |
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| control center (or integration center) |
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Definition
| receives and processes the information supplied by the receptor. The control center then sends out commands. |
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| What is the job of the effector? |
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| The effector, is a cell or organ that responds to the commands of the control center and whose activity either opposes or enhances the stimulus. |
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Definition
| when a variation outside the desired range triggers an automatic response that corrects the situation. |
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| In the homeostatic control of body temperature, the control center is in the: |
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| There are two sets of temperature receptors involved in thermoregulation. They are: |
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Definition
| the hypothalamus and the skin. |
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| two effectors involved in thermoregulation are: |
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Definition
| muscle tissue, which relaxes in high heat and sweat glands which accelerate secretion. |
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| What is the primary mechanism of homeostatic regulation? |
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| What is positive feedback? |
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Definition
| when an initial stimulus produces a response that exaggerates or enhances the change in the original conditions, rather than opposing it. |
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Term
| positive feedback: blood clotting |
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Definition
| positive feedback accelerates the clotting process until a blood clot forms and stops bleeding. |
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Term
| when this happens, organ systems begin to malfunction, producing a state known as illness or: |
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| the process in which physiological systems are continually adapting and adjusting to changing conditions. |
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