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nmdcat.online July 28, 2026

Compared with cardiac muscle, the structural organization of actin and myosin in skeletal muscle is:

A. Identical, forming sarcomeres that generate striations
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B. Entirely different, lacking any sarcomeric arrangement
C. Similar, but lacking any connection to Z-lines
D. Arranged randomly, preventing the formation of distinct bands

📝 Explanation

Both skeletal and cardiac muscles are striated. This striation is due to the highly organized, identical structural arrangement of actin and myosin filaments into repeating contractile units called sarcomeres, bounded by Z-lines.

📖 Additional Information

  • Identical, forming sarcomeres that generate striations
  • Entirely different, lacking any sarcomeric arrangement
  • Similar, but lacking any connection to Z-lines
  • Arranged randomly, preventing the formation of distinct bands

Both skeletal and cardiac muscles are striated. This striation is due to the highly organized, identical structural arrangement of actin and myosin filaments into repeating contractile units called sarcomeres, bounded by Z-lines.

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