Circulatory System

4. A very small vein, esp. one collecting blood from the capillaries.
5. vena cava receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins
7. pressure is the pressure exerted by circulating blood upon the walls of blood vessels, and is one of the principal vital signs
10. a small branch of an artery leading into capillaries
12. an extremely small blood vessel located within the tissues of the body, that transports blood from arteries to veins
14. The phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
16. is one of two large chambers that collect and expel blood received from an atrium towards the peripheral beds within the body and lungs
17. is an elastic blood vessel that transports blood from various regions of the body to the heart
18. in vertebrates and the higher invertebrates, heart chamber that receives blood into the heart and drives it into a ventricle, or chamber, for pumping blood away from the heart.
20. The phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries.
21. blood vessels which carry blood away from the heart

1. vena cave receives blood from lower limbs and abdominal organs and empties into the posterior part of the right atrium of the heart; formed from the union of the two iliac veins
2. refers to a protein, found in red blood cells, that is responsible for carrying oxygen from the lungs to all other tissues of the body
3. valve with three cusps; situated between the right atrium and the right ventricle; allows blood to pass from atrium to ventricle and closes to
6. backflow when the ventricle contracts
8. The main artery of the body, supplying oxygenated blood to the circulatory system.
9. A rhythmical throbbing of the arteries as blood is propelled through them.
10. node is a section of nodal tissue that lies on the right side of the partition that divides the atria, near the bottom of the right atrium.
11. vein a vein carrying oxygenated blood from the lungs to the left atrium of the heart
13. node is a section of nodal tissue that is located in the upper wall of the right atrium. This node is also referred to as the pacemaker of the heart.
15. A partition separating two chambers, such as that between the nostrils or the chambers of the heart.
19. is located on the right side of the heart. Oxygenated blood from the left ventricle is pumped throughout the body as the mitral valve stays closed during compression. Also functions similarly to maintain blood flow in one direction only.