Across
- 3. Supply oxygen and nutrients to the heart muscle itself
- 7. Prevents backflow into the left atrium during ventricular contraction
- 9. Major artery distributing oxygen-rich blood to systemic circulation
- 10. Divides the left and right sides of the heart
- 12. Prevents backflow of blood into the right atrium
- 13. Pumps blood to the lungs via the pulmonary artery
- 15. Receives deoxygenated blood from the body via the superior and inferior vena cava
- 17. Tiny vessels enabling gas exchange between blood and tissues
- 19. Receives oxygenated blood from the lungs
Down
- 1. Moves blood between heart and lungs for oxygenation
- 2. Delivers oxygenated blood from heart to body tissues
- 4. Carries deoxygenated blood from the right ventricle to the lungs
- 5. Muscle responsible for inspiration and expiration
- 6. Airway connecting the larynx to the bronchi
- 8. Pumps oxygenated blood through the aorta to the body
- 11. Protective sac surrounding the heart
- 14. Main airways that direct air into each lung
- 16. Carry oxygenated blood from the lungs to the left atrium
- 18. Microscopic sacs where oxygen diffuses into capillaries
- 19. Site of gas exchange — oxygen enters blood, carbon dioxide is expelled