Cardiac Muscle

Edit Answers
123456789101112131415161718192021222324252627282930
Across
  1. 5. These large diameter fibres rapidly conduct the action potential beginning at the apex of the heart upward to the remainder of the ventricular myocardium
  2. 8. In muscle, this period is the time interval during which a second contraction cannot be triggered
  3. 9. QRS complex begins with a ________ deflection
  4. 12. The third wave is a dome-shaped upward deflection called the
  5. 13. AV bundle is also called as
  6. 14. First step in the action potential occurs of a contractile fiber
  7. 17. This sets the rhythm of electrical excitation that causes contraction of the heart.
  8. 18. Intercalated discs contain these to hold the fibres and gap junctions together.
  9. 21. High blood K+ level causes
  10. 23. irregular transverse thickenings of the sarcolemma are called
  11. 25. the phase of contraction
  12. 27. The instrument used to record the changes is called
  13. 29. The phase of relaxation.
  14. 30. The mechanism of contraction is similar in cardiac muscle is similar to ________ muscle
Down
  1. 1. A recording of electrical signals is called
  2. 2. __________ Q wave may indicate a myocardial infarction
  3. 3. This is a period of maintained depolarization in contractile fibre
  4. 4. Larger P waves indicate enlargement of
  5. 6. The SA node is a ______ pacemaker
  6. 7. cardiac muscle has a smaller intracellular reserve of ______ ions
  7. 8. In muscle, this period is the time interval during which a second contraction cannot be triggered
  8. 10. The spontaneous depolarization in SA node is a ______ potential
  9. 11. The source of this electrical activity is a network of specialized cardiac muscle fibers called
  10. 15. Number nuclei present in a muscle cell
  11. 16. This is a small upward deflection on the ECG
  12. 19. This cell organelle is larger and more numerous in cardiac muscle fibers than in skeletal muscle fibers.
  13. 20. ECG involves measuring the time spans between waves called
  14. 22. These allow the entire myocardium of the atria or the ventricles to contract as a single, coordinated unit.
  15. 24. the action potential travels along the conduction system and spreads out to excite these fibres
  16. 26. Cardiac excitation normally begins here
  17. 28. The recovery of the resting membrane potential takes place during this phase of action potential