Cardiac Muscles:
• Cardiac muscle cells are shorter than the skeletal muscle cells.
  Cardiac muscle cells are elongated, branched and striated. The striations reflect the regular pattern of distribution of the myofilaments (contractile proteins) inside the cells. Cardiac muscle cells have one nucleus, sometimes two at the centre of the cell. Cardiac cells fit together tightly at dark-staining junctions called intercalated discs. Intercalated discs are found only in cardiac muscle tissue and contain anchoring desmosomes and gap junctions.
• Cardiac muscle cells are found in the heart only.
• By contracting, cardiac muscle squeezes the blood out of the heart and propels it into the blood vessels