B5 - AQA - HOMEOSTASIS AND RESPONSE

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Define Homeostasis.
The maintenance of steady conditions. The ability of the body to maintain a constant internal environment, eg temperature and blood glucose concentration.
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What is a stimulus/i?
Something that sets off a reaction in the nervous system, for example, light, heat, sound, gravity, smell, taste, or temperature. These changes in the environment are detected by receptors in an organism. The plural is stimuli.
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What do all control systems include?
Receptors, Co-ordination Centre/s, and Effectors.
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What is a receptor? Give an example.
An organ/s which recognise and respond to stimuli. Example: any sense organs, etc. ears, eyes, mouth.
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What is a co-ordination centre? What is the purpose?
The coordination centre, such as the brain, spinal cord or pancreas, which receives and processes information from receptors around the body.
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What do effectors, muscles and glands do?
Effectors, muscles and glands all bring about responses which restore optimum levels?
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What does Homeostasis control in the Human Body?
- blood glucose concentration, body temperature + water levels.
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What will Negative Feedback do if the levels are too high?
1) Receptor detects a stimulus - level is too high. 2) The coordination centre receives and processes the information, then organising a response. 3) The effector will produce a response, counteracting the change and restores the level to optimum.
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What will Negative Feedback do if the levels are too low?
1) Receptor detects a stimulus - level is too low. 2) The coordination centre receives and processes the information, then organising a response. 3) The effector will produce a response, counteracting the change and restores the level to optimum.
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What is found in the CNS?
The Brain + The Spinal Cord.
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What are sensory neurones?
The neurones that carry information as electrical impulses from the receptors to the CNS.
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What are motor neurones?
The neurones that carry electrical impulses from the CNS to effectors.
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What are effectors?
All muscles and glands, responding to nervous impulses.
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What is a synapse?
A gap // connection between two neurones.
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Other cards in this set

Card 2

Front

What is a stimulus/i?

Back

Something that sets off a reaction in the nervous system, for example, light, heat, sound, gravity, smell, taste, or temperature. These changes in the environment are detected by receptors in an organism. The plural is stimuli.

Card 3

Front

What do all control systems include?

Back

Preview of the front of card 3

Card 4

Front

What is a receptor? Give an example.

Back

Preview of the front of card 4

Card 5

Front

What is a co-ordination centre? What is the purpose?

Back

Preview of the front of card 5
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