Heart A level biology

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Across
  1. 1. period of relaxation of the heart muscle, accompanied by the filling of the chambers with blood.
  2. 4. Where the cardiac muscle is contracting
  3. 7. An abnormally slow heartbeat.
  4. 9. Lots of purkyne fibres that penetrate the septum.
  5. 10. continuously generates electrical impulses, thereby setting the normal rhythm and rate
  6. 11. Major vein which brings deoxygenated blood from the body
  7. 12. Where the cardiac muscle is in a relaxed state.
  8. 14. electrical gatekeeper between the atria and ventricles
Down
  1. 2. general name to any abnormal rhythm of the heart
  2. 3. Extra heartbeats out of the normal rhythm
  3. 5. An abnormally fast heartbeat.
  4. 6. valves which stop backflow of blood into the ventricles.
  5. 8. conduction system to create synchronized contractions of its ventricles
  6. 13. The tip of the left ventricle, opposite the base of the heart.