Occurs only in the heart, forms the myocardium
Resembles both skeletal and smooth muscle, but is unique in its structural details and automatic, spontaneous contractions
Cells are short, branched, striated, with intercalated discs
Supplied by autonomic nervous system
Cells are connected by gap junctions, acting as a single functional unit (syncytium)
High mitochondrial content for continuous aerobic metabolism
Contractions controlled by pacemaker cells