The nerve-impulse thus aroused is conveyed to the brain, and there translated into sound.
It was said in the preceding chapter that when a muscle contracts, it must first receive a nerve-impulse.
Now, anything which starts this nerve-impulse is called the stimulus.
In human action it is evident that there is always a stimulus to start the nerve-impulse which causes the action.
The nerve-impulse passing into the fibers of the muscles causes them to contract.
a signal transmitted along a nerve fiber, starting with stimulation and then a wave of progressive alteration of electricity and becoming a record of sensation or instruction to act
nerve impulse n.
A wave of physical and chemical excitation that moves along a nerve fiber in response to a stimulus.