Biology B1 2.1 Responding to change.

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What does the nervous system do?
Allows humans to react to their surroundings and coordinates behaviour.
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What do receptors do?
Detect external stimuli.
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What passes to the brain along neurons?
Electrical impulses.
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What does the brain coordinate?
Responses to many stimuli.
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What are neurons?
Nerve cells which are found in nerves and carry electrical impulses.
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What does the nervous system have?
Receptors to detect stimuli.
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Where are receptors found?
In sense organs, the eye, ear, nose, tongue and skin.
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What stimulates receptors in the eye and what is the result?
Light stimulates receptors in the eye and electrical impulses then pass to the brain along neurons (nerve cells).
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What other stimuli stimulates receptors in the sense organs?
Sound, chemicals, temperature changes, touch and pain.
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What do the brain and spinal cord form?
The central nervous system (CNS).
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What do nerves contain?
Neurons.
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What do sensory neurons do?
Carry electrical impulses from receptors to the central nervous system (CNS).
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What do motor neurons do?
Carry impulses from the central nervous system (CNS) to effector organs which may be muscles or glands.
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How do muscles respond to impulses carried by motor neurons from the central nervous system (CNS) ?
By contracting.
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How do glands respond to impulses carried by motor neurons from the central nervous system (CNS)?
By secreting (releasing) chemicals.
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What stimuli are detected by the sense organs?
Light, sound, chemicals, touch, pain and temperature change.
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How do impulses pass from the receptor to the central nervous system (CNS)?
As electrical impulses along a sensory neuron.
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Other cards in this set

Card 2

Front

What do receptors do?

Back

Detect external stimuli.

Card 3

Front

What passes to the brain along neurons?

Back

Preview of the front of card 3

Card 4

Front

What does the brain coordinate?

Back

Preview of the front of card 4

Card 5

Front

What are neurons?

Back

Preview of the front of card 5
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