Across
- 1. Main artery of the body
- 5. Valve located between the left atrium and left ventricle
- 7. Smallest blood vessels where gas exchange occurs
- 9. The 'pacemaker' of the heart
- 10. The term for the entire set of heart valves collectively
- 11. A type of blood cell responsible for oxygen transport
- 12. Blood vessels that carry blood toward the heart
- 15. Valve located between the right atrium and right ventricle
- 16. Lower chamber of the heart
- 18. The period of the heart's relaxation between contractions
- 19. Protein in red blood cells that carries oxygen
Down
- 2. Blood vessels that carry blood away from the heart
- 3. Large vein that brings deoxygenated blood from the body to the right atrium
- 4. The process of blood flow from the heart to the lungs and back
- 6. The heart's electrical conduction system component that transmits impulses from the atria to the ventricles
- 8. Fluid portion of the blood
- 10. Blood vessel that supplies oxygenated blood to the heart muscle
- 13. Muscular partition between the right and left sides of the heart
- 14. Upper chamber of the heart
- 17. The period when the heart contracts to pump blood