anatomy: circulatory system

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Across
  1. 5. elastic artery
  2. 6. electrical junctions that are composed of connexion protein channels
  3. 13. anterior surface of the heart
  4. 14. thoracic compartment that occupies space in between the lungs
  5. 15. person that has a heart
  6. 18. returns oxygenated blood from lungs to left atrium
  7. 20. valves that are forced to open pressure is raised in the pulmonary trunk
  8. 21. valves that close when the blood pushing up is under the cusps
Down
  1. 1. forcibly fill the ventricles with blood
  2. 2. valve that is made up of two cusps or flaps
  3. 3. lubricate the wall of the heart so it can beat without friction
  4. 4. receives deoxygenated blood from body through veins
  5. 7. proteins span the distance between adjacent plasma membranes
  6. 8. valve that is composed of three cusps or flaps
  7. 9. located above the heart
  8. 10. four heart valves open and close in response to pressure in this
  9. 11. narrow space filled with pericardial fluid
  10. 12. thickest and consists of two tissue layers
  11. 16. the narrow end of the heart and directed downward and left
  12. 17. attached to blood vessels of the heart
  13. 19. secreted by the serous membranes