1. Circulatory System
Includes the heart, and all of the body’s blood vessels and the blood that runs through them

2. Cardiovascular System
Transportation system of blood
Diagrams: Red- O2 rich blood
Blue- CO2 rich blood

3. Blood Vessels Closed system
Three categories: arteries, capillaries, veins

4. 1. Arteries
- carries blood away from heart - largest vessels, thick walls

5. 2. Capillaries Connect arterioles and venules
Small diameter, very thin walls ,
exchanges site (blood and cells)

6. 3. Veins
- carries blood back to the heart - pressure very low - muscular contractions & valves (keeps blood from flowing downward) (dia. 6.34, p.183)

7. Blood flow(dia.6.35, p.183) Heart Arteries → arterioles→ capillaries→
venules →
veins

8. Structures of the Heart
Chambers of the heart

9. The Heart Made of muscles tissue, size of fist, four chambers:
Right atrium, Right Ventricle
Left atrium, Left Ventricle
Each atrium opens to the ventricle
Blood moves through atrio-ventricular valves
(no backward movement!)

10. Vessels attached to Heart
Veins-Superior and inferior vena cava and pulmonary veins are attached to the atria (enter heart)
Arteries- aorta and pulmonary arteries are attached to ventricles to carry blood away from heart

11. Functions of Heart
Diastole- lowest when heart at rest, blood filling atria
Diastolic pressure- min. Pressure in arteries
Few tenths of seconds later,
Systole- blood pressure at maximum during contraction of the ventricles (push blood into aorta, pulmonary artery))
Systolic pressure- max. Pressure observed during systole

14. Circulation
Two systems forming a double pump
See p. 185, fig.6.38

17. Pulmonary Circulation
- Blood circulating through lungs
Shorter route
Right side pump
Rich in carbon dioxide
See workbook p. 110

18. 2. Systemic Circulation Carries oxygenated blood
Circulating blood to entire body
Left side is pump
See workbook p. 110

19. REMEMBER Pulmonary and systemic circulation occur simultaneously
Two atria contract at same time
Two ventricles contract at the same time