Introduction
Systemic Circulation – delivers blood to all body cells and carries away waste Pulmonary Circulation – eliminates carbon dioxide and oxygenates blood (lung pathway) Arteries - carry blood away from the heart Veins - return blood to the heart Structure of the Heart Heart Size – about 14 cm x 9 cm (the size of a fist) Coverings of the heart Pericardium encloses the heart (like a bag) (visceral, parietal) Pericardial cavity – contains fluid for the heart to float in, reducing friction Wall of the Heart Epicardium – outer layer, reduces friction Myocardium – middle layer, mostly cardiac muscle Endocardium – inner layer, blood vessels and Purkinje fibers Path of Blood Through the Heart Quick Overview 1. Deoxygenated blood enters right atrium through the vena cava 2. Blood moves into the right ventricle 3. Blood goes out the pulmonary arteries and heads to the lungs 4. Blood returns from the lungs and enters the left atrium 5. Blood moves into the left ventricle 6. Oxygenated blood moves out of the left ventricle through the aorta and to the body |
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