The observation that drugs could mimic the effects of nerve stimulation was ... did not believe that chemical transmission was rapid enough to account for impulse transmission in the brain.

(1) A nerve impulse arrives. (2) This causes calcium ion channels to open, resulting in an influx of calcium ions in the terminal. (3) This causes synaptic vesicles to fuse with the terminal ...

Although the nerves in Hydra are connected via neurites, as in more highly developed animals, the nerve impulses are not ... combined the data from the transmission electron microscope with ...