Sir Charles Sherrington observed that impulses took an unexpectedly long time to travel aneural pathway. His observation provided evidence for the existence ofA) antagonists. B) synaptic gaps. C) interneurons. D) neural networks.

b. Synaptic gaps

Explanation:

Synaptic gaps -

It is a biological junction present between the membrane of the cell and the terminal of axon, is referred to as a synaptic gap.

It is also called synaptic cleft.

The gap is important as it present between the pathway for the transfer of any signal within the body.

Hence, from the given information of the question, the correct term from the given options is b. Synaptic gaps.