What are the three main components that work together to maintain a steady condition?
Receptor, Coordination centres, Effectors
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What is the mechanism called, when your automatic control systems keep your internal environment stable?
Negative feedback
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What is negative feedback?
When the level of (e.g. water or glucose) becomes too high or too low, your body uses negative feedback to bring it back to normal optimum levels.
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Describe the negative feedback process to decrease levels. (part 1 and 2)
1) The receptor detects a stimulus (optimum level is too high). 2) The coordination centre receives and processes the information, then organises a response.
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Describe the negative feedback process to decrease levels (part 3)
3)The effector produces a response, which counteracts the change in the environment and restores the optimum level, allowing the level to decrease.
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Describe the negative feedback process to increase levels (part 1 and 2)
1) The receptor detects a stimulus (optimum level is too low). 2) The coordination centre receives and processes the information, then organises a response.
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Describe the negative feedback process to increase levels (part 3).
3) The effector produces a response, which counteracts the change in internal or external environment and restores the optimum level, allowing the level to increase.
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What could be a problem with the effectors response?
The effector will carry on produces the response for as long as they’re stimulated by the coordination centre, therefore this could cause the level change to become too much away from the ideal.
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How would the receptor react to this problem?
The receptor can detect if the level becomes too different from the ideal. Consequently the negative feedback just starts again.
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Why do the internal conditions of your body need to be regulated?
To maintain the right conditions for cells to function properly and for enzymes action.
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Examples of senses, organs and stimuli
Sight - Eyes - Light | Hearing - Ears - Sound | Taste - Tongue - Chemicals in food | Smell - Nose - Chemicals in the air | Touch - Skin - Touch/Pressure/Temperature/Pain/Itching.
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Other cards in this set
Card 2
Front
What is the mechanism called, when your automatic control systems keep your internal environment stable?
Back
Negative feedback
Card 3
Front
What is negative feedback?
Back
Card 4
Front
Describe the negative feedback process to decrease levels. (part 1 and 2)
Back
Card 5
Front
Describe the negative feedback process to decrease levels (part 3)
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