It takes a whole semester to discuss the way muscles and nerves work. Things discussed are
cellular sodium / potassium pump (calcium facilitates ) ,
neurotransmitters like acetylcholine that transfer electrochemical signals across synapses ,
myelin sheath along the nerve fiber for insulation,
and the neural net that transmits multiple signals not just yes and no.
Let us see if someone can put the whole topic in just 1 paragraph - I could not