What is the difference between "muscle contraction produced by CNS" and muscle contraction produced through electrical stimulation"?
Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell.
Muscle contractions are produced through the application of electrical current to activate peripheral motor nerves that innervate a targeted muscle. A muscle contracts when the applied electrical current depolarizes the axonal membranes and thereby generates action potentials in the muscle's lower motor axons.