Cardiovascular System

2. denoting or relating to a valve formed of three triangular segments
4. relating to or denoting the arteries which surround and supply the heart
5. a band or bundle of fibrous tissue in a human or animal body that has the ability to contract
9. a membrane, or sac, that surrounds your heart
13. relating to the heart
16. the thin, smooth membrane which lines the inside of the chambers of the heart and forms the surface of the valves
17. a hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation
19. the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions
20. the phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood
21. a rhythmical throbbing of the arteries as blood is propelled through them, typically as felt in the wrists or neck
22. the main artery of the body, supplying oxygenated blood to the circulatory system
24. a colorless, odorless reactive gas
25. one of two large chambers toward the bottom of the heart

1. any of the fine branching blood vessels that form a network between the arterioles and venules
3. the process of becoming smaller.
6. a partition separating two chambers, such as that between the nostrils or the chambers of the heart.
7. a device for controlling the passage of fluid or air through a pipe
8. denoting or relating to the mitral valve
10. a red protein responsible for transporting oxygen in the blood of vertebrates. Its molecule comprises four subunits
11. a small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting
12. any of the tubes forming part of the blood circulation system of the body
14. each of the two upper cavities of the heart from which blood is passed to the ventricles
15. a mechanical device using suction or pressure to raise or move liquids
18. any of the muscular-walled tubes forming part of the circulation system by which blood
23. The phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries