Circulatory and Respiratory Systems

2. Force exerted by blood as it moves through blood vessels.
3. Cells whose primary job is to defend the body.
7. Chambers that receive blood returning to the heart.
9. A muscular tube where air passes through from the nostrils. It serves as a passageway for air and food.
11. Plays an important role in blood clotting.
14. Tiny blood vessels that allow gas exchange in the blood.
15. a system used to type blood.
16. Blood vessels that carry blood away from the heart.
17. A flap of tissue that ensures that the blood or fluid does not backflow.
18. An antigen found in the surface of the blood.
21. A system that functions like a network of highways.
22. A passageway for air. It is also called the voicebox.
24. Cluster of air sacs. It is where gas exchange happens.
25. Carry blood back towards the heart.
27. Carries oxygen
28. Carries freshly oxygenated blood to the heart muscle

1. Also known as the windpipe. It is a long straight tube in the chest cavity.
4. one of the largest artery of the body
5. A system that collects and recycles fluids leaked by the cardiovascular system. It is involved in fighting infections.
6. Series of pressure waves within an artery caused by contractions of the left ventricle.
8. Leads to the lungs and divides into tubes.
10. When an area of the brain dies.
11. Liquid portion of the blood.
12. Collect oxygen-poor blood from the body
13. Small cluster of cardiac muscle that initiates contraction of the heart. It is embedded in the upper wall of the right atrium.
17. Thick-walled chambers that pump blood away from the heart
19. Occurs when an area of the heart muscle stops and dies.
20. Powerful muscle spanning the rib cage under the lungs.
23. A condition in which the oxygen carrying capacity of the blood is reduced.
26. Small tubes originating from the bronchi