1. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Heart

2. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Heart

3. Right Atrium

4. Right Ventricle

5. Left Atrium

6. Left Ventricle

7. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Mammalian Circulation Blood begins its flow with the right ventricle pumping blood to the lungs In the lungs, the blood loads O 2 and unloads CO 2 Oxygen-rich blood from the lungs enters the heart at the left atrium and is pumped through the aorta to the body tissues by the left ventricle The aorta provides blood to the heart through the coronary arteries

8. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Blood returns to the heart through the superior vena cava (blood from head, neck, and forelimbs) and inferior vena cava (blood from trunk and hind limbs) The superior vena cava and inferior vena cava flow into the right atrium

9. Fig. 42-6 Superior vena cava Pulmonary artery Capillaries of right lung 3 7 3 8 9 2 4 11 5 1 10 Aorta Pulmonary vein Right atrium Right ventricle Inferior vena cava Capillaries of abdominal organs and hind limbs Pulmonary vein Left atrium Left ventricle Aorta Capillaries of left lung Pulmonary artery Capillaries of head and forelimbs Animation: Path of Blood Flow in Mammals Animation: Path of Blood Flow in Mammals

10. Anatomy of Blood Vessels Closed system of tubes that carries blood –Arteries carry blood from heart to tissues elastic arteries muscular arteries arterioles –Capillaries are thin enough to allow exchange –Veins that bring blood back to the heart from tissues venules

11. Large artery (elastic) Medium artery (muscular) Small artery (arteriole) Capillary Venule Vein Heart General order of Flow

12. Blood Vessel Structure

13. Arterioles, Capillaries and Venules

14. Conducting System