Sport Science

4. The muscular middle layer of the heart wall responsible for pumping blood.
6. Blood vessels that carry blood back to the heart, usually deoxygenated.
9. One of the two upper chambers of the heart where blood enters.
11. Pertaining to the heart.
12. Tiny air sacs in the lungs where gas exchange takes place.
14. The double-layered membrane surrounding the lungs.
15. The part of the body between the neck and the abdomen, containing the heart and lungs.
17. The inner lining of the heart chambers.
18. Structures in the heart that prevent backflow of blood.
19. Referring to the blood vessels that supply blood to the heart muscle itself.
20. The main air passages that branch from the trachea into the lungs.

1. The wall dividing the left and right sides of the heart.
2. The protein in red blood cells that carries oxygen.
3. The largest artery in the body, responsible for distributing oxygenated blood.
5. A dome-shaped muscle that separates the chest cavity from the abdominal cavity, playing a crucial role in breathing.
7. An instrument used to measure blood pressure.
8. The protective sac surrounding the heart.
10. Relating to the lungs or the circulation of blood between the heart and lungs.
13. Tiny blood vessels where gas and nutrient exchange occurs.
16. Blood vessels that carry blood away from the heart, typically oxygen-rich.