Excitation–contraction coupling is the method by which a muscular motion probable during the muscle fiber causes the myofibrils to contract.[19] In skeletal muscle mass, excitation–contraction coupling relies on the immediate coupling involving important proteins, the sarcoplasmic reticulum (SR) calcium release channel (discovered because the ryanodine receptor, RyR) and voltage-gated... http://www.arcadetrainer.com/index.php?params=profile/view/2384888/