cardiovascular system. main function: transportation blood = transport vehicle heart = pump ...
TRANSCRIPT
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Cardiovascular System
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Cardiovascular System
Main function: Transportation Blood = transport vehicle Heart = pump Blood vessels = network of
tubes
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Anatomy of Heart
Size of fist Weight < 1 lb. Apex points toward left
hip Flanked by lungs Surrounded by
pericardium (double-walled sac)
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Layers of the Heart Wall
1. Epicardium – outer layer (pericardium)
2. Myocardium – cardiac muscle
3. Endocardium – endothelium lines chambers
Heart chamber
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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 SideLeft Side
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Double Circulation Loop
Pulmonary circuit: blood to/from lungs
Systemic circuit: blood to/from
all body tissues
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Pathway of blood through Pathway of blood through heartheart
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Pathway of Blood Through Pathway of Blood Through HeartHeart
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 valve
Tricuspid valve
Mitral (bicuspid)
valve
Mitral (bicuspid)
valve
Aortic valveAortic valve
Pulmonary valve
Pulmonary valve
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Pulmonary circuit = low pressure
Systemic circuit = high resistance to blood flow
More powerful pump 3X as thick as right
ventricle
Right Ventricle Left Ventricle
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Coronary Circulation
Coronary arteries
Coronary veins
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Heart Valves
Atrioventricular (AV) valves (tricuspid, bicuspid)
Semilunar valves (pulmonary, aortic)
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Heart Valves
Chordae tendineae: anchors valve flaps in their closed position
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Anatomy of the Heart Video