Across
- 2. gas inhaled for respiration
- 4. contraction phase of the heartbeat
- 7. smallest type of blood vessel
- 8. upper chamber of the heart
- 11. inner lining of the heart
- 12. local widening of an arterial wall
- 13. rapid but regular contractions
- 15. peacemaker of the heart
- 16. instrument to measure blood presure
- 17. irregular contractions of the heart
Down
- 1. high blood pressure
- 3. largest vein in the body
- 5. heartbeat felt by the walls of the arteries
- 6. largest artery in the body
- 9. muscular middle layer of the heart
- 10. abnormal swishing sound
- 14. one of two lower chambers of the heart