Across
- 2. Tissue fluid absorbed by lymph vessels
- 4. nodes Clusters of small, spongy structures
- 6. Vessel that brings blood to the heart
- 9. A protein found on red blood cells
- 12. Lower two chambers of the heart
- 14. Main organs of the respiratory system
- 15. The buildup of fatty material within the walls of arteries
- 17. The yellowish liquid of blood that transports blood cells
- 19. Tubelike passageway at the top of the throat that receives air, food, and liquids from the mouth or nose
- 20. Upper two chambers of the heart
- 21. An organ of the lymphatic system that recycles worn-out red blood cells and produces and stores lymphocytes
- 22. circulation Network of vessels that carry blood from the heart to the body and blood from the body to the heart
- 23. The movement of air into and out of the lungs
Down
- 1. Large muscle below the lungs
- 3. circulation Network of vessels that carry blood to and from the lungs
- 5. Vessel that takes blood away from the heart
- 7. Microscopic sacs where gas exchange occurs
- 8. Tube that is held open by C-shaped rings of cartilage
- 10. circulation Network of arteries and veins that supply blood to all the cells of the heart
- 11. Small, irregularly shaped pieces of cells that plug wounds and stop bleeding
- 13. The tiniest blood vessels that deliver supplies to individual cells and take away waste materials
- 14. Triangle-shaped area that air from the pharynx passes into
- 16. Part of the immune system that helps destroy microorganisms that enter the body
- 18. Narrow tubes that the trachea branches into that lead to the lungs
- 24. An organ of the lymphatic system in which T-cells complete their development