1. Your Majestic Pump: The Human Heart
APL3

2. Cardiovascular system
Composed of:
Heart
Blood vessels ( arteries, veins, capillaries)
Vital for circulation: circulating oxygen to body and toxins (wastes) out

3. Cardiac Output (Performance)
Stroke volume: 80ml at rest
Heart Rate: 70 bpm at rest; 180 during exercise
Cardiac Output: SV * HR = 5600 ml/min
Total blood volume is approx 5-6 liters. Your heart pumps almost entire volume of blood throughout body in 1 minute!

4. Your incredible engine!
How much gas would the average car pump in its life?
Blood pumped in 70 years:
206 million liters, or 50 million gallons
Most efficient engine ever made
Typical hybrid car (60mpg)
New cars (26.5 mpg)

5. Coverings of the Heart Double layered Pericardium
Visceral: inner, delicate lining on surface of heart
Parietal: outer, tough sac fitting loosely around heart
Pericardial cavity: space between 2 layers.
Filled with fluid to friction

7. Wall of heart: 3 Layers Epicardium: protective outer membrane
Myocardium: middle, heart wall, rich in blood
Cardiac muscle
Endocardium: inner lining of heart wall
Purkinje fibers, collagen, elastin, BV’s

8. Heart chambers: Four 2 Atria: Thin walled upper chambers
Receive blood
2 ventricles: Thick walled lower chambers
Pump blood out
R. & L. sides separated by septum

9. One way blood flow: Valves
One set separates the atria & ventricles
Tricuspid: (3 cusps)
Separates Right atria and R. ventricle
Bicuspid: (2 cusps)
Left atria & L. ventricle

10. Valves cont’
Semilunar valves: separate the ventricles from the exits of the heart
Pulmonary SL valve separates R ventricle from the pulmonary artery
Aortic SL valve separates L. ventricle from the aorta