Communication and Homeostasis

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Why do living organism's cells communicate?
To detect and respond to changes in the environment in order to survive
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How do multi-cellular organisms organise and communicate to a change in the environment?
By using the nervous system and endocrine systems
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What is cell signalling?
Communication between cells that allows effective co-ordination of a response.
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What are the two forms of cell signals?
Electrical and chemical.
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How are electrical signals formed?
Through neurons
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How are chemical signals formed?
Through hormones
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Which of the two signals is a faster response?
Electrical signal
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Which of the two signals is long-term?
Chemical signal
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What is homeostasis?
Maintenance of a constant internal environment despite any changes in the external environment
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Why is homeostasis important?
Organisms can only function if internal conditions are kept within a narrow range
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Give three examples of internal conditions?
Temperature, pH and blood glucose levels.
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What is negative feedback?
A process that brings about a reversal in a change in any of the internal conditions
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Why is negative feedback important?
It ensures that the optimum steady state of internal conditions can be maintained.
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What is the process causing negative feedback to occur?
Stimulus--Receptor--Co-ordinator--Effector--Response
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What is a stimulus?
A change in the environment that causes a response.
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What is a receptor?
A cell that detects a stimulus.
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What is a co-ordinator?
An organ that controls actions taken for a response.
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What is an effector?
Brings about a response (muscle/gland)
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What is a response?
A change in behaviour/physiology as a result of a change in the environment
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What is positive feedback?
A process that increases any changes detected by receptors
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Is positive feedback a good thing?
No, it tends to be harmful and doesn't lead to homeostasis
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Other cards in this set

Card 2

Front

How do multi-cellular organisms organise and communicate to a change in the environment?

Back

By using the nervous system and endocrine systems

Card 3

Front

What is cell signalling?

Back

Preview of the front of card 3

Card 4

Front

What are the two forms of cell signals?

Back

Preview of the front of card 4

Card 5

Front

How are electrical signals formed?

Back

Preview of the front of card 5
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