1. The Heart

2. The Location of the Heart in the Thoracic Cavity
Figure 20.2c

3. The pericardia

5. Echocardiogram

6. The cardiovascular system is divided into two circuits
Pulmonary circuit
blood to and from the lungs
System circuit
blood to and from the rest of the body
Vessels carry the blood through the circuits
Arteries carry blood away from the heart
Veins carry blood to the heart
Capillaries permit exchange

7. An Overview of the Cardiovascular System
Figure 20.1

8. Compare (what is the same) and Contrast (what is different) Pulmonary and Systemic Circuits
Oxygenated Deoxygenated
Pressure
Arteries Veins
Color

9. Internal Anatomy and Organization
Atria
Thin walled chambers that receive blood from the vena cavae
Ventricles
Thick walled chambers separated from the atria by AV valves
Chordae tendineae
Tendinous fibers attached to the AV valves
Papillary muscle and trabeculae carneae
Muscular projections on the inner wall of ventricles

10. Blood flow through the heart
Right atria
Tricuspid valve
Right ventricle
Pulmonary valve
Pulmonary circuit
Left atria
Bicuspid valve
Left ventricle
Aortic valve
Aorta and systemic circuit

11. The Sectional Anatomy of the Heart
Animation: Diagrammatic Frontal Section through the Heart
Figure 20.6a, b

12. The Sectional Anatomy of the Heart
Figure 20.6c

13. Heart chambers and valves
Structural Differences in heart chambers
The left side of the heart is more muscular than the right side
Functions of valves
AV valves prevent backflow of blood from the ventricles to the atria
Semilunar valves prevent backflow into the ventricles from the pulmonary trunk and aorta
Leaky valves????

14. Structural Differences between the Left and Right Ventricles
Volume
Thickness of wall
AV valve
Force of contraction
Figure 20.7a-c

15. Valves of the Heart
Figure 20.8a

16. Valves of the Heart
Figure 20.8b

17. Quiz Yourself- pg 463 in lab manual

18. Organization of Heart Tissues

19. The Heart Wall Components of the heart wall include Epicardium
Myocardium
Endocardium

20. The Heart Wall and Cardiac Muscle Cells
Figure 20.5a-c

21. Superficial Anatomy of the Heart
The heart consists of four chambers
Two atria and two ventricles
Major blood vessels of the heart include
Inferior and superior vena cavae
Aorta and pulmonary trunk

22. The Superficial Anatomy of the Heart
Figure 20.3a

23. The Superficial Anatomy of the Heart
Figure 20.3b, c

24. Blood Supply to the Heart
Arteries: right/ left coronary arteries,
Veins: Great cardiac vein, anterior and posterior cardiac veins

25. Coronary Circulation
Figure 20.9c, d

26. By Pass Surgery- Video

27. Complete Activity 2, 3, Lab 30

28. The Conducting System The conducting system includes:
Sinoatrial (SA) node
Atrioventricular (AV) node
Conducting cells
Atrial conducting cells are found in internodal pathways
Ventricular conducting cells consist of the AV bundle, bundle branches, and Purkinje fibers

29. Impulse Conduction through the heart
SA node begins the action potential
Stimulus spreads to the AV node
Impulse is delayed at AV node
Impulse then travels through ventricular conducting cells
Then distributed by Purkinje fibers

30. Impulse Conduction through the Heart
Figure 20.13

34. Pulmonary Edema