Cardiovascular System

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Across
  1. 6. Impulses from the cerebrum or ______________ may influence heart rate through emotions.
  2. 8. The flow of blood when the left ventricle contracts.
  3. 11. An abnormal rate (less than 60 beats/min).
  4. 12. Systolic blood pressure is exerted on the atrial walls when.
  5. 14. The tissue that forms the lining on the surface of the heart.
  6. 15. The region in the middle of the thoracic cavity that is occupied by the heart, great vessels, thymus, and trachea.
Down
  1. 1. The tissue that forms the middle and thickest layer of the heart.
  2. 2. The valve that prevents backwards flow into the left atrium
  3. 3. Oxygen rich blood is carried by this circuit.
  4. 4. A condition in which there is an increase in K+ which decreases heart rate and force of contraction.
  5. 5. Depolarization of atrial muscle fibers.
  6. 7. An abnormal rate (more that 100 beats/min.
  7. 9. A condition in which there is an increase in Ca+2 which increase heart action.
  8. 10. The tissue that forms the inner layer that contains Purkinje fibers of the heart
  9. 12. The "lubb" sound of the heart is caused when which valves close
  10. 13. Polarization of the ventricular muscle fibers.