Neurotransmitters Stimulate Action Potentials

When we have smooth muscle, when you stretch it, it responds by contracting. So a light input to the optic nerve will open up sodium or calcium channels,. And they rush in down their concentration gradient, stimulate an action potential. Same thing happens for a chemical signal. If acid burns my hand, the reason why I feel that is because the acid, the chemical actually opens up channels in my hand to send that signal. The chat- Change in one form to another. That's amazing.