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nmdcat.online July 28, 2026

During a comparative histological examination, a student misidentifies cardiac muscle as skeletal muscle. Which specific structural feature should the instructor point out to correct this misconception?

A. The presence of alternating light and dark bands
B. The peripheral location of the nuclei
C. The cylindrical, unbranched shape of the cells
D. The presence of intercalated discs
✓

📝 Explanation

Both skeletal and cardiac muscles are striated (have light and dark bands). However, cardiac muscle cells are branched, usually have a single central nucleus, and are uniquely joined end-to-end by intercalated discs, which are absent in skeletal muscle.

📖 Additional Information

  • The presence of alternating light and dark bands
  • The peripheral location of the nuclei
  • The cylindrical, unbranched shape of the cells
  • The presence of intercalated discs

Both skeletal and cardiac muscles are striated (have light and dark bands). However, cardiac muscle cells are branched, usually have a single central nucleus, and are uniquely joined end-to-end by intercalated discs, which are absent in skeletal muscle.

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