AQA AL PE Cardiovascular system

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Across
  1. 2. Muscular wall separating the left and right sides of the heart. (6)
  2. 4. Valve between right atrium and right ventricle. (9)
  3. 5. Artery carrying deoxygenated blood from the right ventricle to the lungs. (9,6)
  4. 6. Semilunar valve controlling blood flow into the pulmonary artery. (9,5)
  5. 8. Upper chambers of the heart.(5)
  6. 10. Molecule formed when oxygen binds to haemoglobin. (14)
  7. 12. Vessel bringing oxygenated blood from lungs to the left atrium. (9,4)
  8. 13. Valve between left atrium and left ventricle. (8)
  9. 16. Blood returning to the heart through the veins. (6,6)
  10. 17. Gradual rise in heart rate during steady-state exercise. (14)
  11. 18. Contraction phase of the cardiac cycle. (7)
Down
  1. 1. Branch of the autonomic nervous system that increases heart rate. (11)
  2. 3. Relaxation phase of the cardiac cycle. (8)
  3. 7. Lower chambers that pump blood to lungs or body. (9)
  4. 9. The main artery leaving the left ventricle.(5)
  5. 11. Heart muscle tissue.(10)
  6. 14. Large vein returning deoxygenated blood to the right atrium. (4,4)
  7. 15. System responsible for electrical impulses in the heart. (10)