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Best Answer: Intercalated discs are areas where cardiac muscle cells (among a few other cell types) are joined together. These discs contain gap junctions, which are small pores that connect the cytoplasm of one cell to the next.
The interaction of sliding actin and myosin filaments in smooth muscle is similar to skeletal muscles. There are differences in the proteins involved in contraction in vertebrate smooth muscle compared to cardiac and skeletal muscle.ontractions are initiated by the calcium-activated phosphorylation of myosin rather than calcium binding to the troponin complex that regulates myosin binding sites on actin in skeletal and cardiac muscle. Contractions in vertebrate smooth muscle are initiated by agents that increase intracellular calcium.