CARDIAC MUSCLE

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Across
  1. 3. When a cardiac muscle cell contracts, the ________ filament pulls the actin filaments toward each other.
  2. 6. Cardiac cells have only a single _________.
  3. 10. Cardiac muscle cells also contain _________.
  4. 11. The cell uses ATP to ______ this contraction.
  5. 13. Pacemaker cells control the ________ of your heart.
  6. 14. Cardiac muscle fibers also possess many mitochondria and _______.
  7. 15. The heart acts as a ________ to propel blood.
  8. 18. _________ of cardiac muscle is pumping blood.
  9. 19. Exercise can __________ your cardiac muscle.
  10. 21. Cardiac muscle fibers are ________ than skeletal muscle fibers.
  11. 22. Your nervous system sends _________ to pacemaker cells that prompt them to either speed up or slow down your heart rate.
  12. 23. Pacemaker cells are ________ to other cardiac muscle cells, allowing them to pass along signals.
Down
  1. 1. The heart acts as a pump to propel blood through the _______ vessels.
  2. 2. Cardiac cells have only a _________ nucleus.
  3. 4. Cardiac muscle tissue is one of the three types of _______ tissue.
  4. 5. Cardiac muscle also called heart muscle or ________.
  5. 7. cardiac muscle has __________.
  6. 8. Cardiac muscle cells appear striated or striped under a __________.
  7. 9. Cells joined end-to-end with ________ disk in between.
  8. 12. Its contraction is not under ________ control.
  9. 16. This through specialized cells called _______ cells.
  10. 17. Involuntary heart ________ also a function of cardiac muscle.
  11. 20. ________ muscle is found in the heart wall.