16_Heart

16_Heart - THE HEART Chapter 22 Characteristics and...

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THE HEART Chapter 22
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Characteristics and Functions Functions as the pump of the cardiovascular system Mediates between the systemic and pulmonary circuit On average the heart beats 75/minute, 108,000/day Average cardiac output is 5.25 L/minute
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The Heart Atria (2) Top receiving chambers Ventricles (2) Bottom pumping chambers Pulmonary circuit Vessels that carry blood to and from the lungs Right atria and ventricle Systemic circuit Vessels that transport blood to and from the body tissues Left atria and ventricle
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Heart Orientation Located left of the body midline, posterior to sternum In mediastinum Lies on the diaphragm Base Posterior and superior surface of the heart Apex Anterior and inferior and points to the left hip
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Pericardium Triple layered sack that encloses heart Three layers: Fibrous Pericardium • Attached to diaphragm Double layered serous membrane Parietal layer • Visceral layer Pericardial cavity Space between parietal and visceral layers Contains serous fluid Pericardium functions: Prevents undesired movement Prevents overfilling of heart Reduces friction Pericarditis Inflammation of pericardium
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Epicardium Visceral pericardium Most superficial layer Myocardium Forms bulk of heart Cardiac muscle Located deep to the epicardium Myocardial infarctions
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This note was uploaded on 04/06/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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16_Heart - THE HEART Chapter 22 Characteristics and...

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