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