Homeostasis

What is homeostasis?
The maintenance of a constant internal environment despite external changes
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Give 4 things that need to be maintained in humans
Body temperature, pH, blood glucose concentration, water potential of the blood
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What is negative feedback?
The reversing of a change in the internal environment, bringing the level back to normal
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Outline the negative feedback pathway
Stimulus - Receptor - Communication pathway - Effector - Response
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Give an an example of a stimulus for negative feedback
Low blood temperature/high blood glucose concentration etc.
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What is positive feedback?
When the original change in internal environment is increased, bring the level further away from normal
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Give an example of positive feedback
Hypothermia- When the body temperature falls, enzyme activity decreases causing a further drop in body temperature
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What systems are involved in signalling a change in internal environment to other cells?
Nervous system and endocrine system
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Outline the positive feedback pathway
Change away from optimum/stimulus - Receptor - Communication pathway - Effector - Change away from optimum
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Other cards in this set

Card 2

Front

Give 4 things that need to be maintained in humans

Back

Body temperature, pH, blood glucose concentration, water potential of the blood

Card 3

Front

What is negative feedback?

Back

Preview of the front of card 3

Card 4

Front

Outline the negative feedback pathway

Back

Preview of the front of card 4

Card 5

Front

Give an an example of a stimulus for negative feedback

Back

Preview of the front of card 5
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