A patient with a spinal cord injury has weak voluntary movement but the heart continues to beat automatically. Which muscle type is responsible for the heartbeat?
Correct answer: B. Cardiac muscle
- A. Skeletal muscle
- B. Cardiac muscle
- C. Smooth muscle
- D. Dense connective tissue
Explanation
Cardiac muscle contracts rhythmically and involuntarily to pump blood, even though it is striated. Skeletal muscle produces voluntary movement, whereas smooth muscle is found in organs and blood vessel walls.
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About Skeletal and Muscular Systems
The skeletal and muscular systems include bone structure, joints, cartilage, the axial and appendicular skeleton, and the roles of ligaments and tendons. They also cover skeletal muscle organization, the sliding filament mechanism, neuromuscular contraction, and common differences between voluntary skeletal muscle, cardiac muscle and smooth muscle.
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