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nmdcat.online July 28, 2026

An athlete can consciously stop lifting a weight, but cannot voluntarily stop the heartbeat. This difference exists because cardiac muscle is:

A. Non-living tissue
B. Involuntary in function
✓
C. Non-contractile
D. Attached to bones

📝 Explanation

Correct: Cardiac muscle contracts involuntarily under the control of the autonomic nervous system and pacemaker cells. A: It is living tissue. C: It contracts continuously. D: It is confined to the heart. Concept: Control of muscle contraction.

📖 Additional Information

  • Non-living tissue
  • Involuntary in function
  • Non-contractile
  • Attached to bones

Correct: Cardiac muscle contracts involuntarily under the control of the autonomic nervous system and pacemaker cells. A: It is living tissue. C: It contracts continuously. D: It is confined to the heart. Concept: Control of muscle contraction.

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