Anatomy

2. Blood vessel that carries oxygenated blood away from the heart.
6. The largest artery in the body.
7. The liquid matrix of blood, mostly water.
10. The throat, a common passageway for food and air.
11. One of the two main branches leading from the trachea to the lungs.
12. Clear fluid that circulates through the lymphatic vessels.
15. Tiny, closed-ended vessels that collect interstitial fluid in the tissues.
16. Blood vessel that carries deoxygenated blood toward the heart.
17. 2: Blood Vessels
19. Lymphoid tissue masses in the pharynx that help protect against inhaled or ingested pathogens.
20. The iron-containing protein in red blood cells that transports oxygen.

1. The windpipe, which connects the larynx to the bronchi.
3. Primary lymphoid organ where T-cells mature.
4. Dome-shaped muscle beneath the lungs essential for breathing.
5. Scientific name for a red blood cell.
8. Protein produced by B cells to neutralize pathogens.
9. Tiny air sacs in the lungs where gas exchange occurs.
13. Cell fragment essential for blood clotting.
14. Structures in veins that prevent the backflow of blood.
17. Smallest and most numerous blood vessels, site of gas and nutrient exchange.
18. Largest lymphatic organ, filters blood and removes old red blood cells.