Circulatory System

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Across
  1. 2. shape of the heart
  2. 4. Secretions from the squamous cells help regulate the activity of the myocardium.
  3. 6. when the heart muscle contracts.
  4. 10. performance of the human heart from the beginning of one heartbeat to the beginning of the next.
  5. 11. heart valve that separates the right atrium from the right ventricle
  6. 14. There are two..located between the atrium and the ventricle on either side of the heart
  7. 16. Groups of specialized cells in the right atrium that send out the heart's electrical signals
  8. 17. direct blood flow from the ventricles into the aorta and pulmonary trunk artery.
  9. 19. connection or opening between two things that are normally diverging or branching.
  10. 20. pressure of circulating blood against the walls of blood vessels
  11. 21. consists of an external layer of simple squamous and an inner layer of areolar tissue
Down
  1. 1. the .... pumps blood out of the heart into the aorta and pulmonary trunk arteries.
  2. 3. hollow muscular organ that pumps blood throughout the body
  3. 5. when the heart muscle relaxes
  4. 7. covers and protects the anterior side of the heart
  5. 8. consist of the heart blood vessels and blood
  6. 9. composed of three tissue layers.
  7. 12. blood that has a low oxygen saturation relative to blood leaving the lungs
  8. 13. refers to the blood that has been exposed to oxygen in the lungs.
  9. 15. iron containing protein in red blood cells
  10. 18. it passes over the heart from the left ventricle and runs down in front of the backbone.