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nmdcat.online July 28, 2026

Compared with smooth muscle, cardiac muscle is better adapted for continuous rhythmic contractions because it:

A. Lacks mitochondria
B. Possesses intercalated discs and abundant mitochondria
✓
C. Is voluntarily controlled
D. Contains spindle-shaped cells

📝 Explanation

Correct: Intercalated discs synchronize contraction, while abundant mitochondria provide continuous ATP for rhythmic activity. A: Cardiac muscle is rich in mitochondria. C: It is involuntary. D: Spindle-shaped cells are characteristic of smooth muscle. Concept: Functional adaptations of cardiac muscle.

📖 Additional Information

  • Lacks mitochondria
  • Possesses intercalated discs and abundant mitochondria
  • Is voluntarily controlled
  • Contains spindle-shaped cells

Correct: Intercalated discs synchronize contraction, while abundant mitochondria provide continuous ATP for rhythmic activity. A: Cardiac muscle is rich in mitochondria. C: It is involuntary. D: Spindle-shaped cells are characteristic of smooth muscle. Concept: Functional adaptations of cardiac muscle.

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