Sir Charles Sherrington observed that impulses took an unexpectedly long time to travel a neural pathway. His observation provided evidence for the existence of

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Sherrington's observation of the delay in impulse transmission across a neural pathway provided evidence for the existence of synaptic gaps (or synapses), which are the small gaps between neurons where neurotransmitters are released to carry the signal from one neuron to the next. This discovery was crucial in understanding how neurons communicate with each other.

Sir Charles Sherrington Observed That Impulses Took an Unexpectedly Long