Across
- 2. Veins conduct blood ____ the heart from tissue.
- 3. Two upper chambers of the heart are called ____.
- 5. The ____ lines the inside of the heart and its valves.
- 7. The pacemaker of the heart.
- 8. ____ are the 2 lower chambers of the heart.
- 9. A membranous sac that surrounds the heart.
- 11. The largest artery in the body.
- 13. Record that is used to detect electrical charges in the heart muscle.
- 15. ____ is the contraction phase of the heart.
Down
- 1. The 3 types of blood vessels in the body are arteries, veins and ____.
- 4. The largest vein in the body.
- 6. The middle muscular layer of the heart is the ____.
- 10. ____ is the relaxation phase of the heart.
- 12. Arteries carry blood ____ ____ the heart.
- 14. Which atrium receives rich oxygenated blood?