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nmdcat.online July 28, 2026

A decrease in extracellular calcium concentration would least affect the contraction of which type of muscle tissue?

A. Cardiac muscle
B. Multi-unit smooth muscle
C. Single-unit smooth muscle
D. Skeletal muscle
✓

📝 Explanation

Skeletal muscle contraction relies almost entirely on intracellular calcium released from the well-developed sarcoplasmic reticulum. Cardiac and smooth muscles heavily depend on the influx of extracellular calcium to trigger contraction (calcium-induced calcium release).

📖 Additional Information

  • Cardiac muscle
  • Multi-unit smooth muscle
  • Single-unit smooth muscle
  • Skeletal muscle

Skeletal muscle contraction relies almost entirely on intracellular calcium released from the well-developed sarcoplasmic reticulum. Cardiac and smooth muscles heavily depend on the influx of extracellular calcium to trigger contraction (calcium-induced calcium release).

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