Cardiac terms Period 6

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Across
  1. 4. space where the heart resides
  2. 7. the study of the heart
  3. 9. period of cardiac muscle relaxation
  4. 11. heart's middle layer
  5. 12. pointed end of the heart
  6. 13. two upper chambers of the heart
Down
  1. 1. double-walled sac surrounding the heart
  2. 2. thin layer covering the heart surface
  3. 3. two lower chambers of the heart
  4. 5. the heart's inner layer
  5. 6. where the great vessels enter and leave the heart
  6. 8. ventricular contraction
  7. 10. ability to contract without stimulation