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1. Cardiovascular System: Heart
Anatomy

2. Cardiovascular System
 Main function: Transportation
 Blood = transport vehicle
 Heart = pump
 Blood vessels = network of
tubes

3. Anatomy of Heart
 Size of fist
 Weight < 1 lb.
 Apex points toward left hip
 Flanked by lungs
 Surrounded by pericardium
(double-walled sac)

5. Layers of the Heart Wall
1. Epicardium – outer
layer (pericardium)
2. Myocardium –
cardiac muscle
3. Endocardium –
endothelium lines
chambers
Heart chamber

7. Heart Chambers
 Atrium (R& L): receive
blood (entryway)
 Ventricle (R& L):
pump blood out
 Septum: wall between
atria & ventricles
 Valves: prevent
backflow of blood
Right Side
Left Side

8. Double Circulation Loop
 Pulmonary circuit:
blood to/from lungs
 Systemic circuit:
blood to/from all
bodytissues

9. Pathway of blood through heartPathway of blood through heart

10. Pathway of Blood Through HeartPathway of Blood Through Heart
To Right Atrium:
•Superior vena cava (above
diaphragm)
•Inferior vena cava (below
diaphragm)
•Coronary sinus (from
myocardium)
To Left Atrium:
•4 Pulmonary veins (lungs
to heart)
Right Ventricle:
•2 Pulmonary arteries (to
lungs)
Left Ventricle:
•Aorta (to body)
 Coronary arteries
Tricuspid valveTricuspid valve
Mitral (bicuspid)
valve
Mitral (bicuspid)
valve
Aortic valveAortic valve
Pulmonary valvePulmonary valve

11.  Pulmonary circuit = low
pressure
 Systemic circuit = high
resistance to blood flow
 More powerful pump
 3X as thick as right
ventricle
Right Ventricle Left Ventricle

12. Coronary Circulation
Coronary arteries
Coronary veins

13. Heart Valves
 Atrioventricular (AV) valves (tricuspid, bicuspid)
 Semilunar valves (pulmonary, aortic)

14. Heart Valves
 Chordae tendineae: anchors valve flaps in their
clo se d position

16. Anatomy of the Heart Web Activity
http://www.wisc-online.com/Objects/ViewObject.aspx?
ID=ap12504