Why skeletal muscles are called striated muscles?

Correct answer: C. Alternating dark and light bands appear on their surface when visualized via a microscope.

  • A. They appear darker than smooth muscles by naked eye.
  • B. Alternating dark and light bands appear on their surface when visualized by naked eye.
  • C. Alternating dark and light bands appear on their surface when visualized via a microscope.
  • D. All of these

Explanation

Skeletal muscle is called striated because microscopic examination shows repeating alternating dark A bands and light I bands. Students may choose b because the bands are visible as a pattern, but they are not normally resolved by the naked eye.

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Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.

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