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nmdcat.online July 28, 2026

During an experiment, three muscle samples are stimulated under identical conditions. One sample contracts rhythmically without fatigue and continues beating after isolation. This sample is most likely:

A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
✓
D. Tendon

📝 Explanation

Correct: Cardiac muscle possesses intrinsic rhythmicity and resists fatigue, allowing continuous contraction. A: Skeletal muscle fatigues comparatively quickly. B: Smooth muscle contracts slowly and is not intrinsically rhythmic in the same manner. D: Tendons do not contract. Concept: Functional adaptation of cardiac muscle.

📖 Additional Information

  • Skeletal muscle
  • Smooth muscle
  • Cardiac muscle
  • Tendon

Correct: Cardiac muscle possesses intrinsic rhythmicity and resists fatigue, allowing continuous contraction. A: Skeletal muscle fatigues comparatively quickly. B: Smooth muscle contracts slowly and is not intrinsically rhythmic in the same manner. D: Tendons do not contract. Concept: Functional adaptation of cardiac muscle.

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