Learning Outcomes Identify the role of the brain in muscle movement Excitation–Contraction Coupling Excitation–contraction coupling is the link (transduction) between the action potential generated in the sarcolemma and the start of a muscle contraction. The trigger for calcium release from the sarcoplasmic reticulum into the sarcoplasm is a neural signal. Each skeletal muscle fiber is … Continue reading Neural Stimulation of Muscle Contraction