The Heart: 21

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1. The heart is located between the lungs in an area known as what? Mediastinum
2. What arrangement of cardiac muscle fibers makes a heart efficient? arranged spirally around the heart
3. What is the innermost layer of the heart wall called? endocardium
4. Which cell type makes up most of the myocardium? cardiac muscle
5. Is the apex of the heart superior or inferior to the rest of the heart? inferior
6. What is the name of the depression on the anterior surface of the heart that is between the two ventricles? intraventricular sulcus
7. Are the auricles extensions of the atria or the ventricles? atria
8. What separates the left atrium from the right atrium? intratrial septum
9. What is the name of the thin spot between atria? fossa ovalis
10. The bicuspid valve is located between what two chambers of the heart? between the left atrium and left ventricle
11. Name the structure between the left atrioventricular valve and papillary muscle. Chordae tendinea (tendinous chords)
12. What adaptation do you see with the walls of the left ventricle being thicker than those of the right ventricle? thicker to pump back to the rest of the body
13. What is the function of the aortic valve? prevents back flow from the aorta into the left ventricle
14. What is another name for the tricuspid valve? right atrioventricular valve
15. What three vessels take blood to the right atrium? superior vena cava, inferior vena cava, coronary sinus
16. The great cardiac vein and the middle cardiac vein lead to what vessel? right atrium
17. What blood vessels nourish the heart tissue? coronary arteries
18. The sinoatrial node has a common name. What is it? pacemaker
19. After the AV node depolarizes, what structures conduct the impulse to the myocardium of the ventricles? atrioventricular bundle --> right and left bundle branches --> purkinje (conduction) fibers