The Circulatory System

4. Also known as red blood cells. Transports oxygen and they are filled with hemoglobin.
5. These valves prevent backflow into the ventricles from the pulmonary trunk and aorta.
8. These valves prevent backflow of blood from the ventricles to the atria.
12. The pressure in your arteries when your heart rests between beats.
13. Strong walls, the inner layer is very smooth so that the blood can flow easily.
14. They are irregularly shaped, have colorless bodies that are present in blood. It’s function is to clot blood.
15. Food and oxygen released to the the body cells. Carbon dioxide and other waste products returned to the bloodstream.
16. In this circuit, blood flows to and from the lungs.
18. The cells that make up 45% of the blood volume.
21. Thick-walled, pumping chambers separated from atria by AV valves.
23. These cells make up 99% of the cells in the atria and ventricles. They also do the pumping.
25. Have strong, muscular walls. The inner layer is very smooth so that the blood can flow easily.
26. The largest vein.
27. The amount of blood pumped by the left ventricle of the heart in one contraction.
28. The thin outer layer of the heart wall.
29. The pressure in your arteries when your heart beats.
30. Divides the heart
31. This system is divided into two parts: Pulmonary Circuit and the Systemic Circuit.

1. The force of circulating blood on the walls of the arteries.
2. The heart muscle itself.
3. Also known as white blood cells. Attacks foreign substances and they use phagocytosis to engulf bacteria.
6. Smooth, thin membrane lining the heart’s inner surface.
7. The period between the start of the one heartbeat and the beginning of the next.
9. The fluid that makes up 55% of the blood volume.
10. This fluid helps protect the heart and maintain position.
11. In this circuit, blood flows to and from the rest of the body.
17. Listening to the heart sound through the stethoscope.
19. The measurement that indicates the number of heartbeats per minute.
20. Valves are located inside the veins. The valves only allow blood to move in one direction.
22. These cells are responsible for the electrical impulse which triggers the heart to pump blood.
24. The amount of blood pumped by each ventricle in one minute.