feedback mechanism (1 Viewer)
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Huy
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Surviving Under Changing Conditions
http://www.thomsonlearning.com.au/b...1.html?/biology/guide/unit_3/s2.html~maintext
Scroll down to "Feedback Systems"
Plenty of diagrams there to help you visualise it.
Background
The body has some effective mechanisms to alter body temperature. To reduce temperature, heat can be expelled by sweating or radiation of heat from the skin. To increase heat, the body can responds by shivering or by contracting the skin. These responses can be activated by heat receptors. If a mechanism is activated, it will operate until receptors indicate that the optimum temperature has been reached.
If receptors in the skin detect heat, they relay information via the nerves to the hypothalamus, which also contains receptors sensitive to the heat of passing blood. This triggers the sympathetic nervous system to dilate skin capillaries and activate sweat glands. When receptors in the skin detect a low temperature, a negative feedback mechanism is activated to stop the original action. If skin temperature is still low, the hypothalamus may activate thyroid hormones to increase metabolic rate, activate the sympathetic nervous system to shut down skin capillaries and sweat glands and activate food metabolism in the liver to produce heat. In this way, the body can maintain a stable body temperature.
* Gather samples of feedback mechanisms from biology texts. Often, analogies, such as the operation of a thermostat in a refrigerator or an air conditioning system, are used.
* Process the samples to identify the common elements of each system. Evaluate the validity of your sources by checking the reputation of the sources and by looking to see how consistently the information compares.
* Analyse and use the information to design a creative model to represent a feedback mechanism. The model might be a physical model, e.g. maybe based on a see-saw action, or it might be a conceptual model, based on an analogy.
http://www.thomsonlearning.com.au/b...1.html?/biology/guide/unit_3/s2.html~maintext
Scroll down to "Feedback Systems"
Plenty of diagrams there to help you visualise it.
Background
The body has some effective mechanisms to alter body temperature. To reduce temperature, heat can be expelled by sweating or radiation of heat from the skin. To increase heat, the body can responds by shivering or by contracting the skin. These responses can be activated by heat receptors. If a mechanism is activated, it will operate until receptors indicate that the optimum temperature has been reached.
If receptors in the skin detect heat, they relay information via the nerves to the hypothalamus, which also contains receptors sensitive to the heat of passing blood. This triggers the sympathetic nervous system to dilate skin capillaries and activate sweat glands. When receptors in the skin detect a low temperature, a negative feedback mechanism is activated to stop the original action. If skin temperature is still low, the hypothalamus may activate thyroid hormones to increase metabolic rate, activate the sympathetic nervous system to shut down skin capillaries and sweat glands and activate food metabolism in the liver to produce heat. In this way, the body can maintain a stable body temperature.
* Gather samples of feedback mechanisms from biology texts. Often, analogies, such as the operation of a thermostat in a refrigerator or an air conditioning system, are used.
* Process the samples to identify the common elements of each system. Evaluate the validity of your sources by checking the reputation of the sources and by looking to see how consistently the information compares.
* Analyse and use the information to design a creative model to represent a feedback mechanism. The model might be a physical model, e.g. maybe based on a see-saw action, or it might be a conceptual model, based on an analogy.
Last edited:
so you and huy haven't actually got married yet? i thought you did. watch out Huy doesn't come dressed as Clark Kent to the wedding
Anyway attatched is my feedback mechanism. I hope its what you're looking for
Anyway attatched is my feedback mechanism. I hope its what you're looking for
Huy
Active Member
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No, we're not married yet.Originally posted by s2ophie
so you and huy haven't actually got married yet? i thought you did. watch out Huy doesn't come dressed as Clark Kent to the wedding
at the Clark Kent comment....I already look like Kent, what with the glasses and the speedy typing, not to mention the six pack (cough)
:whistles:
Almost There
Member
thanks for diagram. very good!!