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Q: _____ are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.
  • A. Myofibril
  • B. Sarcomeres
  • C. Cross bridges
  • D. Z band
Correct Answer: Option B - A sarcomere is the complicated unit of striated muscle tissue. It is the repeating unit between two Z lines. Sarcomere are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.
B. A sarcomere is the complicated unit of striated muscle tissue. It is the repeating unit between two Z lines. Sarcomere are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.

Explanations:

A sarcomere is the complicated unit of striated muscle tissue. It is the repeating unit between two Z lines. Sarcomere are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.