The HEART: What d you already know?

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Across
  1. 2. The heart’s natural pacemaker, initiating electrical impulses for each heartbeat (2 words)
  2. 4. The amount of blood ejected by a ventricle per heartbeat
  3. 7. The waveform on an ECG representing ventricular depolarisation
  4. 8. A heart rate below the normal resting range, characteristic of bradycardia
  5. 10. The valve that prevents backflow of blood from the right ventricle into the right atrium
  6. 13. The process in which cardiac muscle shortens and generates force
  7. 15. Rapid and irregular contraction of cardiac muscle fibres
  8. 16. The total volume of blood the heart pumps per minute (2 words)
  9. 17. The thick muscular layer of the heart responsible for contraction
Down
  1. 1. The protective sac surrounding the heart, containing lubricating fluid
  2. 3. The structure that electrically connects the atria and ventricles, delaying impulses to allow ventricular filling (2 words)
  3. 5. The heart chamber responsible for pumping deoxygenated blood to the lungs (2 words)
  4. 6. The valve that opens to allow blood flow from the left ventricle to the aorta
  5. 9. The percentage of ventricular filling that occurs before atrial contraction
  6. 11. 12 complete ECG patterns are recorded from a subject over 10 seconds. What is their heart rate?
  7. 12. The valve that prevents backflow of blood from the left ventricle into the left atrium
  8. 14. The phase of the cardiac cycle when the heart muscle relaxes and chambers fill with blood