3. Heart Anatomy (pg 2)
• Heart: muscular pump that provides the force
necessary to circulate blood to all tissues in
the body
4. Heart Anatomy (pg 2)
• Heart: muscular pump that provides the force
necessary to circulate blood to all tissues in
the body
• Pumps about 5 liters of blood per minute
5. Location
• Between the lungs. Rests on the diaphragm.
Most superior portion is at the level of the
second rib
6. Location
• Between the lungs. Rests on the diaphragm.
Most superior portion is at the level of the
second rib
• 2/3 of the heart is to the left of the body
midline
7. Location
• Between the lungs. Rests on the diaphragm.
Most superior portion is at the level of the
second rib
• 2/3 of the heart is to the left of the body
midline
• Heart is about the size of a closed fist
12. Heart Wall
• Called the myocardium and made of cardiac
muscle
• Cells are connected by intercalated disks
13. Heart Wall
• Called the myocardium and made of cardiac
muscle
• Cells are connected by intercalated disks
• Myocardium is supplied with oxygenated
blood by the coronary arteries, which branch
off the aorta
14. Heart Wall
• Called the myocardium and made of cardiac
muscle
• Cells are connected by intercalated disks
• Myocardium is supplied with oxygenated
blood by the coronary arteries, which branch
off the aorta
• Blockage of coronary artery = heart attack
15. Chambers of the Heart
Atria: thin-walled chambers that receive blood
from veins.
16. Chambers of the Heart
Atria: thin-walled chambers that receive blood
from veins.
Ventricles: thick-walled chambers that forcefully
pump blood
17. 1. Right Atrium: receives deoxygenated blood
from the superior and inferior vena cava
18. 1. Right Atrium: receives deoxygenated blood
from the superior and inferior vena cava
2. Right Ventricle: pumps blood through the
pulmonary arteries to the lungs, where it
becomes oxygenated
19. 1. Right Atrium: receives deoxygenated blood
from the superior and inferior vena cava
2. Right Ventricle: pumps blood through the
pulmonary arteries to the lungs, where it
becomes oxygenated
3. Left Atrium: receives oxygenated blood from
the lungs via the pulmonary veins
20. 1. Right Atrium: receives deoxygenated blood
from the superior and inferior vena cava
2. Right Ventricle: pumps blood through the
pulmonary arteries to the lungs, where it
becomes oxygenated
3. Left Atrium: receives oxygenated blood from
the lungs via the pulmonary veins
4. Left Ventricle: Pumps oxygenated blood to
the body via the aorta. Thickest, strongest
chamber
25. Valves of the Heart
Valves prevent blood from flowing backward
26. Valves of the Heart
Valves prevent blood from flowing backward
1. Atrioventricular (AV) valves: Between atria
and ventricles
27. Valves of the Heart
Valves prevent blood from flowing backward
1. Atrioventricular (AV) valves: Between atria
and ventricles
• Anchored by strings called the
chordaetendineae, which prevents the valve
from letting blood back into the atria
28. Valves of the Heart
Valves prevent blood from flowing backward
1. Atrioventricular (AV) valves: Between atria
and ventricles
• Anchored by strings called the
chordaetendineae, which prevents the valve
from letting blood back into the atria
• Right = tricuspid valve
29. Valves of the Heart
Valves prevent blood from flowing backward
1. Atrioventricular (AV) valves: Between atria
and ventricles
• Anchored by strings called the
chordaetendineae, which prevents the valve
from letting blood back into the atria
• Right = tricuspid valve
• Left = bicuspid (mitral) valve
30. 2. Semilunar Valves: located at the bases of
blood vessels that carry blood from the
ventricles
31. 2. Semilunar Valves: located at the bases of
blood vessels that carry blood from the
ventricles
• Each valve has 3 cup-like cusps. When blood
flows back toward the ventricles, the cups fill
with blood, causing the valve to close
32. 2. Semilunar Valves: located at the bases of
blood vessels that carry blood from the
ventricles
• Each valve has 3 cup-like cusps. When blood
flows back toward the ventricles, the cups fill
with blood, causing the valve to close
• Pulmonary SL valve: at exit of right ventricle
33. 2. Semilunar Valves: located at the bases of
blood vessels that carry blood from the
ventricles
• Each valve has 3 cup-like cusps. When blood
flows back toward the ventricles, the cups fill
with blood, causing the valve to close
• Pulmonary SL valve: at exit of right ventricle
• Aortic SL valve: at exit of left ventricle