EXCITATION-CONTRACTION COUPLING IN THE HEART
Excitation-contraction coupling describes the process by which an electrical signal (an action potential) results in contraction of a myocyte. In the heart, the mechanism responsible is called Ca-induced Ca-release.
You need to have a basic knowledge of cellular excitability and the cardiac action potential before watching this video (see “The cardiac action potential”). You should also find comparisons with excitation-contraction coupling in skeletal muscle (see “The neuromuscular junction”).