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BIO NMDCAT Muscles
nmdcat.online July 28, 2026

The physiological mechanism ensuring that cardiac muscle functions as a single, coordinated unit (a functional syncytium) heavily relies on the presence of:

A. Desmosomes and gap junctions
✓
B. Extensive T-tubule networks
C. Neuromuscular junctions on every cell
D. Multinucleated cell structures

📝 Explanation

Intercalated discs contain two key structures: desmosomes, which mechanically bind the cardiac cells together so they don't tear apart during contraction, and gap junctions, which electrically couple the cells, allowing the action potential to spread rapidly across the entire heart.

📖 Additional Information

  • Desmosomes and gap junctions
  • Extensive T-tubule networks
  • Neuromuscular junctions on every cell
  • Multinucleated cell structures

Intercalated discs contain two key structures: desmosomes, which mechanically bind the cardiac cells together so they don't tear apart during contraction, and gap junctions, which electrically couple the cells, allowing the action potential to spread rapidly across the entire heart.

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