Cardiovascular

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Across
  1. 3. Ventricles contract after the atrium due to this; approximately 100 msec
  2. 13. Has rapid rise in membrane potential due to fast Na+ channels; 99% of cardiac cells
  3. 14. Side of heart with the SA and AV node
  4. 15. The heart wall’s innermost part; has endothelial tissue
  5. 18. The heart wall’s outermost part; has pericardial fluid
  6. 19. Pacemaker activity goes from the right atrium to the left atrium through this pathway
  7. 22. Describes when the heart closes its chambers to keep blood amounts constant; can happen during ventricular contraction or relaxation
  8. 24. This node is at the bottom of the right atrium; has 50 action potentials per minute
  9. 25. This type of blood circulation travels to/from the lungs
Down
  1. 1. This type of tissue forms a ring around the valves
  2. 2. 1% of cardiac muscle cells have this type of activity; allows for the heart’s autorhythmicity
  3. 4. Measures the voltage difference between 2 spots on the body surface; detects the heart’s electrical activity reaching the body’s surface
  4. 5. This type of blood circulation travels to/from the organs
  5. 6. This valve allows blood to flow from the right atrium to the right ventricle
  6. 7. Sound produced from valve not opening completely and blood is at high velocity
  7. 8. This valve allows blood to flow from the left atrium to the left ventricle
  8. 9. These channels let Na+ in and results in the initial rise of the pacemaker membrane potential; before threshold is reached
  9. 10. These fibers extend throughout the ventricular myocardium; has 30 action potentials per minute
  10. 11. The heart wall’s middle part; has gap junctions and desmosomes
  11. 12. This node is near the superior vena cava; has 70 action potentials per minute
  12. 16. Pacemaker activity goes from the SA node to the AV node through this pathway
  13. 17. This allows blood from either the head or the organs to go into the right atrium
  14. 20. This valve allows blood to flow from the left ventricle to the aorta
  15. 21. Side of heart with more muscle
  16. 23. This part of the action potential in a contractile cell allows for the heart to not fatigue/steady contractions