Do muscles contract in response to electrical signals?

Yes, muscles contract in response to electrical signals. The process of muscle contraction is initiated by an electrical signal called an action potential. This signal travels along the motor neuron, which is a nerve cell that connects the brain and spinal cord to the muscles. When the action potential reaches the muscle, it causes the release of calcium ions into the muscle cells. Calcium ions then bind to proteins called troponin and tropomyosin, which causes the muscle fibers to slide past each other and shorten, resulting in muscle contraction.