How do impulses travel through the CNS? gcse biology

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username5934435
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How do impulses travel through the CNS?
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macpatgh-Sheldon
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At your level keep it simple.

CNS = brain + spinal cord.

Impulses travel away from the cell body along an axon. An impulse is initiated

EITHER: FROM the brain e.g. via a motor nerve to initiate contraction of a muscle

OR: when a sense organ is activated by a stimulus e.g. a hair cell in the inner ear [cochlea] for hearing sends an impulse along a sensory nerve TO the brain other e.g. a rod or cone in the eye sends an impulse to the back of the brain so making vision possible, [yeah?]

OR: when impulses travel from one part of the brain to another e.g. when we see s-t and we recognize it the message to the brain from the eyes interacts [sends a message WITHIN the brain] with the "memory centre" of the brain to compare past and present info

Impulses pass from one neurone [nerve cell] to the next at a synapse where a chemical messenger diffuses from the 1st cell to the 2nd and stimulates or inhibits a receptor.
Last edited by macpatgh-Sheldon; 2 months ago
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Can I say: "Along relay neurones"
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macpatgh-Sheldon
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(Original post by 77677)
Can I say: "Along relay neurones"
If it is a one mark Q, then yes that would probs earn you your mark
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#5
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How many mark will this question have?
What is your prediction?
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