A synapse can only pass an impulse in one direction. Why?
Answer and explanation
Correct answer: A. Transmitter is released on one side and receptors are on the other
- Step 1: Chemical transmitter is stored in vesicles on the first neurone.
- Step 2: Receptors for it are only on the next neurone, so the impulse travels one way.
Answer
Transmitter is released on one side and receptors are on the other.
Why not the others: The impulse moves faster in one direction than the other: speed does not explain it. The neurones on either side are different lengths: length does not decide direction. The synapse is closed by hormones after each impulse: hormones do not close synapses.
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