Human Body Systems

3. the number of chambers in the heart
7. the straw-coloured fluid that forms part of the blood
9. The rings around the trachea and parts of the ear are made of this
11. dome-shaped muscle that moves up and down beneath your lungs
13. Blood vessels with walls 1 cell thick. This is where gas exchange happens in the blood
15. Animals with hooves and four chambers in their stomachs
17. bean shaped organs that filter waste from the blood
19. The system involved in gas exchange (breathing)
20. The technical name for the windpipe
23. cells that defend the body from infection

1. The air sacs in the lungs
2. The air passages that carry air in and out of the lungs
4. Blood vessels that carry blood back to the heart
5. The system that carries oxygen and nutrients to cells and waste materital away from cells via the blood
6. The system involved in processing and obtaining nurtrients from food
8. Common respiratory condition caused by the narrowing of the bronchioles
10. also called the colon. About 1.5m long and involved in absorbing vitamines and water
12. small disc-like cells found in blood that oare involved with forming clots
14. organs found in the ribcage that are part of the respiratory system
16. cells that carry oxygen around the body
18. The system involved in filtering out waste and controlling contents of body fluids
21. Blood vessels that carry blood away from the heart
22. place where urine is stored