arrhythmia04

arrhythmia04 - CARDIOVASCULAR SYSTEM ANATOMY AND PHYSIOLOGY...

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CARDIOVASCULAR SYSTEM ANATOMY AND PHYSIOLOGY
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PYRAMID POINTS Location and function of the sinoatrial node Location of the coronary arteries Function of the left ventricle
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STRUCTURES OF THE HEART From Monahan, F. & Neighbors, M. (1998). Medical-surgical nursing: Foundations for clinical practice, ed 2, Philadelphia: W.B. Saunders
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HEART AND HEART LAYERS The heart is located in the left side of the mediastinum The epicardium covers the outer surface of the heart The myocardium is the middle layer and is the actual contracting muscle of the heart The endocardium is the innermost layer and lines the inner chambers and heart valves
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PERICARDIUM Encases and protects the heart from trauma and infection The parietal pericardium is the tough, fibrous outer membrane that attaches anteriorly to the lower half of the sternum, posteriorly to the thoracic vertebrae, and inferiorly to the diaphragm The visceral pericardium is the thin, inner layer that closely adheres to the heart The pericardial space is between the parietal and visceral layers; it holds 5 to 20 ml of pericardial fluid that lubricates the pericardial surfaces and cushions the heart
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HEART CHAMBERS The right atrium receives deoxygenated blood from the body via the superior and inferior vena cava The right ventricle receives blood from the right atrium and pumps it to the lungs via the pulmonary artery The left atrium receives oxygenated blood from the lungs via four pulmonary veins The left ventricle is the largest and most muscular chamber; it receives oxygenated blood from the lungs via the left atrium and pumps blood into the systemic circulation via the aorta
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ATRIA OF THE HEART From Canobbio MM (1990) Cardiovascular disorders , St. Louis, Mosby.
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HEART VALVES The atrioventricular (AV) valves lie between the atria and ventricles The AV valves close at the beginning of ventricular contraction and prevent blood from flowing back into the atria from the ventricles; these valves open
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arrhythmia04 - CARDIOVASCULAR SYSTEM ANATOMY AND PHYSIOLOGY...

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