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11 Cards in this Set
- Front
- Back
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stimulus
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change in external environment
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Change in external environment
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respond to increase chances of survival
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change in internal environment
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respond to return to optimal metabolic conditions
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Receptors
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detect stimuli
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specific receptor
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only detect one particular stimulus
eg. light, pressure, glucose concentration |
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types of receptors
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receptors can be cells
eg. photoreceptors are receptor cells that connect to cns or proteins on cell surface membrane |
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Effector
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cells that bring a response to a stimulus to produce an effect
eg. muscle cells, glands |
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Cell signalling
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Communication between receptor and effector via the nervous and hormonal system.
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Reason for keeping internal environment constant
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Maintaining normal function, preventing damage
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Factors to maintain in body
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Core body temperature, concentration of blood glucose
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When body temp too high
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Enzymes may become denatured.
Enzymes molecules vibrate too much and, hydrogen bonds that hold 3d shapes broken. 3d shape creates active site, if changed no longer works as a catalyst. Metabolic reactions less efficient. |
