1. The Human Heart– Structure

2. Interesting Facts
In your lifetime, your heart beats about 3 billion times without a single break
The aorta, the largest artery in your body, is almost the diameter of a garden hose
The heart pumps about 1 million barrels of blood during an average lifetime

3. Anatomy of the Heart The Pericardium Structure
a double wall sac covering the heart
Function
protects and anchors the heart
provides a friction-free environment
Figure 13.2

4. Anatomy of the Heart Four Chambers Right and Left Atrium
Think 4’s!
Four Chambers
Right and Left Atrium
Right and Left Ventricle -separating the chambers is the septum
Four Vessels
Inferior/Superior Vena Cava and Aorta
Pulmonary Artery and Pulmonary Vein
Four Valves
Tricuspid and Bicuspid Valve
Pulmonary and Aortic Semilunar Valve

5. Anatomy of the Heart
Review Heart Anatomy Here
Figure 13.4

6. Flow of Blood Through the Heart
Right side of the heart pumps deoxygenated blood to the lungs
Pulmonary circuit
Figure 13.6

7. Flow of Blood Through the Heart
Left side of the heart pumps oxygenated blood to the body
Systemic circuit
Figure 13.6

8. Click here to see how the blood flows through the heart!
Flow of Blood Through the Heart
Atria pump together
Ventricles pump together
Valves between chambers direct blood flow in proper sequence
Click here to see how the blood flows through the heart!
Figure 13.6

9. Pathway of Blood – Pulmonary and Systemic Circuits
R. Atrium
R. Ventricle
Pulmonary Artery
BCV
PSLV
Vena Cava
Lungs
Aorta
ASLV
TCV
L. Ventricle
L. Atrium
Pulmonary Vein

10. Heart Valves Blood flows through the heart in one direction.
Heart valves open and close to prevent the backflow of blood within the heart.
The valves open and close in response to differences in blood pressure.
Figure 13.5

11. Heart Valves Atrioventricular (AV) valves (bicuspid and tricuspid)
Prevent backflow into atria when ventricles are contracting
Chordae tendinae and papillary muscles anchor and hold valve flaps when closed

12. Heart Valves Semilunar (SL) valves
Prevent backflow into ventricles when ventricles relax
Flaps are small cups, shaped like ‘half moon’
Lack chordae tendinae of the AV valves, because they close under less pressure
Click here to see how the valves work