Download HeartStructure

The Human Heart– Structure
Today’s Learning Goal
• Learn and memorize external anatomy of
the heart, including all chambers and
vessels.
• Learn and begin to memorize the flow of
blood through the heart.
Check for Understanding - Friday
• Label chambers and vessels on heart
image.
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
Heart External Anatomy
Review Heart Anatomy Here
Heart Chambers
Review Heart Anatomy Here
Heart Vessels
Review Heart Anatomy Here
Anatomy of the Heart
Think Four!
Four Chambers
• Right and Left Atrium
• Right and Left Ventricle
Four Vessels
• Inferior/Superior Vena Cava and Aorta
• Pulmonary Artery and Pulmonary Vein
Four Valves
• Tricuspid and Bicuspid Valve
• Pulmonary and Aortic Semilunar Valve
Flow of Blood Through the Heart
 Right side of the
heart pumps
deoxygenated
blood to the lungs
 Pulmonary circuit
Flow of Blood Through the Heart
 Left side of the heart
pumps oxygenated
blood to the body
 Systemic circuit
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!
Pathway of Blood – Pulmonary and Systemic
Circuits
R. Atrium
Pulmonary Artery
R. Ventricle
TCV
PSLV
Vena Cava
Lungs
Aorta
ASLV
L. Ventricle
BCV
L. Atrium
Pulmonary Vein
Anatomy of the Heart
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
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
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
Pericardium
Structure
• a double wall sac covering the heart
Function
• protects and anchors the heart
• provides a friction-free environment