Anatomy of the heart

3. ventricle contracts to pump oxygen-poor blood through the pulmonary valve into the
7. chambers of the heart are separated by partitions called
10. a smooth layer of endothelial cells, lines the interior of the heart and heart valves.
11. separates the two upper chambers (atria)
12. (cusps are the flaps of the valves) into the
14. a muscular wall, lies between the two lower chambers (ventricles).
15. The walls of the left atrium contract to force blood through the

1. It must pump blood with great force so that the blood travels through arteries to all parts of the body. The left ventricle propels the blood through the
2. The right atrium contracts to force blood through the
4. The walls of the left atrium contract to force blood through the mitral valve into the
5. The venae cavae bring oxygen-poor blood that has passed through all of the body to the
6. the right ventricle contracts to pump oxygen-poor blood through the
8. Oxygen-poor blood enters the heart through the two largest veins in the body
9. The left ventricle propels the blood through the aortic valve into the
13. The newly oxygenated blood enters the