Intercalated discs are a feature of which muscle type?

Intercalated discs are a feature of which muscle type?

• A. Skeletal muscle tissue
• B. Cardiac muscle tissue
• C. Smooth muscle tissue
• D. Connective tissue

Answer: (B)

Intercalated discs are specialized cell-to-cell junctions that connect heart muscle cells. They combine desmosomes and fascia adherens to hold cells together mechanically, with gap junctions that allow ions to pass quickly between cells. This setup lets cardiac muscle cells electrically couple and contract in a synchronized, rhythmic fashion, which is essential for pumping blood. Skeletal muscle cells are individual fibers controlled by nerves and don’t form these end-to-end junctions, and smooth muscle cells may synchronize activity but lack the distinct intercalated discs seen in cardiac tissue. So, this feature is characteristic of cardiac muscle tissue.

Intercalated discs are specialized cell-to-cell junctions that connect heart muscle cells. They combine desmosomes and fascia adherens to hold cells together mechanically, with gap junctions that allow ions to pass quickly between cells. This setup lets cardiac muscle cells electrically couple and contract in a synchronized, rhythmic fashion, which is essential for pumping blood. Skeletal muscle cells are individual fibers controlled by nerves and don’t form these end-to-end junctions, and smooth muscle cells may synchronize activity but lack the distinct intercalated discs seen in cardiac tissue. So, this feature is characteristic of cardiac muscle tissue.