Across
- 2. Extending from each side of the nodule is aa narrow thin lip termed the _____
- 7. Referred to as the bundle of His
- 8. The heart is described as having how many surfaces?
- 10. Valve that guards the opening of the aorta
- 12. From the crista terminalis these are muscular, ridge-like extensions
- 13. The heart has four internal cavities called _______
- 15. Partition between the right atrium and the left atrium
- 18. Arises from the left aortic sinus
- 21. The cardiac muscle itself is referred to as ______
- 22. Receives the impulse coursing through the wall of the atria, holds it for a short time, and then sends the impulse to the AV bundle
- 23. Courses with the marginal artery and ends in the coronary sinus
- 26. Spaces between the cusps and the wall of the vessels
- 32. Blood flows from the left atrium into the left ventricle through the _____.
- 33. Short, wide vessel that receives all three cardiac veins
- 35. ______ is a fibroserous sac that encloses the heart
- 36. An atrioventricular valve is characteristically composed of three parts: _____, chordae tendineae, and papillary muscle.
Down
- 1. The inner epithelial lining of the chambers of the heart is referred to as endocardium.
- 3. Cord-like band connecting the pulmonary trunk and the aortic notch
- 4. Referred to as the pacemaker
- 5. The outer layer of the pericardium blends with the diaphragm _____
- 6. Blood leaves the left ventricle, enters the ____, and passes to all parts of the body
- 9. Ear like appendages attached to the lateral surface of the atria
- 11. Vertical muscular ridge seen on the posterior wall of the posterior wall of the right atrium
- 14. ________ protects the heart anteriorly
- 16. Blood when passing from the atria to the ventricles, moves ______
- 17. Internal surface of the ventricle consists of irregular, ridge-like projections of muscle
- 19. One major difference between the right ventricle and the left ventricle is the _____ of the wall
- 20. Connective tissue cords that attach to the lower surface of the cusps
- 24. A rounded projection of the heart, points inferiorly and to the left
- 25. Numerous small veins that drain the myocardium itself and empty separately into all four chambers.
- 27. Free edge of each cusp has a small central thickening of fibrous tissue
- 28. The aorta, pulmonary trunk, and superior vena cava attach here on the heart.
- 29. Oxygenated blood returns to the heart via four _____.
- 30. Veins draining the heart
- 31. Arises from the right aortic sinus and emerges between the pulmonary trunk and right auricle
- 34. The heart is positioned in such a way that the atria lie _____ to the ventricles