The Heart: What do you know?

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Across
  1. 4. Persistently elevated arterial blood pressure
  2. 6. The valve preventing backflow from the right ventricle to the right atrium
  3. 12. A measure of the time between successive ventricular depolarisations on an ECG (2 letters)
  4. 13. The arterial pressure when the heart is relaxed between beats
  5. 15. The body system that rapidly adjusts heart rate and vessel diameter to regulate blood pressure (3 words)
  6. 17. The valve that allows blood to leave the left ventricle into the aorta
  7. 19. A regular sequence of electrical activity producing a normal heartbeat (2 words)
  8. 20. The ECG interval between ventricular repolarisation and the next atrial depolarisation (2 letters)
Down
  1. 1. The ECG wave representing atrial depolarisation (2 words)
  2. 2. The structure that delays electrical impulses between atria and ventricles (2 words)
  3. 3. The heart’s natural pacemaker that initiates each heartbeat (2 words)
  4. 5. The heart chamber that pumps deoxygenated blood to the lungs (2 words)
  5. 7. The reflex that rapidly stabilises blood pressure when standing up (2 words)
  6. 8. A heart rate that is slower than normal
  7. 9. The phase of the cardiac cycle when the heart muscle relaxes and fills
  8. 10. The total volume of blood pumped by the heart each minute (2 words)
  9. 11. The ECG waveform representing ventricular depolarisation (2 words)
  10. 14. The pressure in the arteries during ventricular contraction
  11. 16. The volume of blood ejected by a ventricle with each heartbeat (2 words)
  12. 18. The phase of the cardiac cycle when the heart muscle contracts