Cardiac Muscle

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Across
  1. 3. ____ Junctions allow electrical conduction between cells
  2. 5. cardiac cells only have a single ______.
  3. 6. A structure that ensures mechanical stability in cardiac cells.
  4. 8. The organelle where intracellular calcium is removed after contraction
  5. 10. Protein that binds calcium and moves the troponin complex, initiating muscle contraction
  6. 11. ___________ discs connect adjacent cardiac cells
  7. 13. The natural pacemaker of the heart, initiating the cardiac action potential
Down
  1. 1. The basic structural and functional unit of striated muscle
  2. 2. The sarcolemma of cardiac muscle cells contains voltage-gated _____channels
  3. 4. a period of rest that prevents tetanus from occurring
  4. 7. Cardiac muscle cells are rich in __________ due to high energy demands.
  5. 9. branched fibres that carry the electrical impulse to the ventricles
  6. 12. The node that delays the electrical impulse briefly before it travels on to the ventricles.