The regulation of the internal conditions of a cell or organism in response to internal and external changes
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Why is homeostatis important?
It keeps conditions constant for enzyme action and cell functions
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What does homeostatis control?
Blood glucose concentrations, body temperature and water and ion levels
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What do all control systems include?
Receptors, co-ordination centres and effectors
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What are receptors?
Detect stimuli, changes in the environment
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What are co-ordination centres?
Recieve and process information from receptors
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What are effectors?
Bring about responses that restore optimum levels
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What is the process of negative feedback?
The co-ordinating centre compares the stimulus to a set point; an effector produces a response to correct the difference; a receptor a change in stimulus; repeat
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What does the nervous system do?
Enables humans to react to their surroundings and co-ordinate their behaviour
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What is the CNS?
It co-ordinates the response of effectors
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What are reflex actions?
Automatic and rapid actions that protect the body and aren't concious decisions
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What is the process of a reflex action?
The pain stimulus is detected by receptors; impulses pass along a sensory neurone to the effector; impulses pass through a relay neurone; motor neurone carries an impulse to effector; effector responds
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How do neurones connect to each other?
Synapses (gaps between neurones)
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What happens when an electrical impulse reaches a synapse?
A chemical is released that diffuses across the gap between the two neurones which causes an electrical impulse to be generated in the second neurone
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Other cards in this set
Card 2
Front
Why is homeostatis important?
Back
It keeps conditions constant for enzyme action and cell functions
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