Circulatory & Respiratory Systems Crossword

2. the large dome shape muscle that contracts when we inhale
3. microscopic air sacs where gas exchange takes place
6. the component of blood that contains dissolved gases and minerals
9. the valve that connects the two right chambers of the heart
12. the component of blood responsible for clotting and healing broken blood vessels
14. keeps oxygenated blood from flowing from the aorta back to the right ventricle
16. the large vein through which oxygen-poor blood from the top half of the body enters the heart
19. the vessel that returns oxygenated blood to the heart
22. smaller braches of the bronchi
23. the valve that connects the left atrium and ventricle
26. the first chamber that deoxygenated blood enters in the heart
27. the two tubes that connect trachea to lungs
28. the first chamber that oxygenated blood enters in the heart

1. the component of blood that fights infection
4. the protein in red blood cells that binds to oxygen
5. the only artery in the body that contains deoxygenated blood
7. the last chamber that oxygenated blood enters in the heart
8. the large vein through which oxygen-poor blood from the top half of the body enters the heart
10. the largest artery in the body
11. the tiniest blood vessels in the body
13. the area in the back of the throat
14. this is the largest type of blood vessel in the body
15. the chamber that deoxygenated blood leaves when it enters the pulmonary arteries
17. the type of blood vessel that carries deoxygenated blood back towards the heart
18. these vessels supply the heart muscle cells with oxygen-rich blood
20. the muscle layer in the heart that contracts causing the heart to beat
21. the component of blood that contains hemoglobin and carries oxygen
24. the tube that moves air from the mouth and nose to the lungs
25. the voicebox