Cardiovascular system

3. narrow end of the heart.
4. holds the heart in place forming a barrier against infections.
6. drains blood from anterior ventricles.
8. controls blood flow from the right atrium to the right ventricle.
9. the broad end of the heart.
12. thin, tendor like cords which connect AV valves to cone shaped muscles.
13. transports oxygen depleted blood from the thorax, abdomen, and lower extremities.
15. layer which covers the heart valves and tendons.
16. drain blood from the anterior right ventricle.
17. dense irregular connective tissue forming the external layer of heart.
19. returns oxygenated blood from the lungs to the left atrium.
20. removes blood from the lateral and posterior right ventricle.

1. protect heart, composed of 3 tissue layers.
2. what the heart is made up of.
5. occupies the space between the lungs.
7. where the apex is located.
10. the movement of the valves
11. the heart is located underneath this.
14. direct blood flow from the ventricles into the aorta and pulmonary trunk artery.
18. the thick middle layer of the heart wall.