Answer :
Cardiac muscle cells are both striated and interconnected by intercalated discs.
The intercalated disc or Eberth's line is a microscopic feature of the cardiac muscle.
The cardiac muscle is connected by discs into which individual cardiac muscle cells (cardiomyocytes) are inserted and act as a single functional syncytium.
Skeletal muscle, on the other hand, is composed of multinucleated muscle fibers and does not have an embedded intervertebral disc. The inserted disc supports the synchronized contraction of heart tissue.
The intercalated disc is a complex structure that connects adjacent cardiomyocytes. Three types of cell junctions that have been recognized to form intercalated discs are desmosomes, fascial attachment junctions, and gap junctions.
The fascial attachment is the anchoring site for actin and connects to the nearest sarcomere.
Desmosomes prevent separation during contraction by binding intermediate filaments, anchoring the plasma membrane to the intermediate filament network, and binding cells.
Gap junctions electrically connect the cytoplasm of adjacent cells, allow the passage of ions between cells, and cause myocardial depolarization, thereby allowing cardiac action potentials to propagate between cells in the heart. increase.
All these nodes work together as a single entity called the Area Composita.
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