SME
Grade 9 Science · Problem type
Across a synapse
Use this for “How does a signal pass from one neuron to the next?”
Put in order
Put the steps in order: an impulse reaches the end of an axon.
1
?
2
?
3
?
4
?
5
?
6
?
Assumptions
•
Neurons do not touch: a tiny gap, the synapse, separates the end of one axon from the next cell.
•
A chemical, the neurotransmitter, carries the signal across the gap, so it passes one way only.
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Membrane potential through an impulse
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Which part of the nervous system?
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