Cardiovascular

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Across
  1. 4. flow of blood from one side of the heart to the other
  2. 6. heart and blood system
  3. 7. valve between the left atrium and right ventricle
  4. 9. the mildest form of a heart attack
Down
  1. 1. how the heart pumps deoxygenated blood to the lungs
  2. 2. the innermost layer of the heart
  3. 3. double membranes sac that surrounds the heart
  4. 5. cells that control the conducting system
  5. 8. when one blood vessel gets blocked, another blood vessel can take over
  6. 10. doesn’t take continued stimulation by any nerve to keep the heart muscle cells contracting