Chapter 28 - Chapter 28 Part 1 Cardiology Cardiology the...

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Chapter 28, Part 1 : Cardiology Cardiology - the study of the heart and it’s function Cardiovascular disease (CVD)- disease affecting the heart, peripheral blood vessels, or both. Coronary heart disease (CHD)- a type of CVD; the single largest killer of Americans. Cardiovascular Anatomy Mediastinum - Three tissue layers of the heart 1. Endocardium - the innermost layer 2. Myocardium - the muscular middle layer Epicardium - outer later of the heart 3. Pericardium - the protective sac surrounding the heart 4 Chambers of the heart 1. 2. Heart Valves Mitral Valves o Mitral valve - between the left atrium and Ventricle o Tricuspid valve - between the right atrium and ventricle Semi-lunar Valves o Aortic valve - between the left ventricle and aorta o Pulmonary valve - between the right ventricle and pulmonary artery. Vessels o Arteries Pulmonary artery- takes O2 deficient blood to the lungs to get reoxygenated. Aorta o Veins Vena Cava- brings deoxygenated blood from the body back to the heart (right atrium) Superior Vena Cava Inferior Vena Cava Pulmonary Vein- takes Oxygenated blood back to the left artery o Coronary arteries - supply nutrients and O2 to the heart from the Aorta Left coronary artery - supplies the left ventricle, interventricular septum, part of the right ventricle, and the conduction system. Has 2 main branches: Anterior descending artery - Circumflex artery Right coronary artery - supplies a portion of the right atrium and right ventricle and part of the conduction system. Has 2 major branches: Posterior descending artery
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Marginal artery Cardiac Physiology Cardiac Cycle o -Systole- part of the cardiac cycle when the heart is contracting , and the semi-lunar valves open o -Diastole - part of the cardiac cycle when the heart is relaxed and cardiac filling and profusion occur. Ejection fraction - each ventricle ejects about 2/3 of the blood it contains Stroke volume - the amount of blood ejected from the ventrical Preload - is the end-diastolic volume and influences the force of the next contraction because of the stretch it exerts (Starling’s Law) Afterload - is the resistance against which the heart muscle ust pump. Cardiac output = Stroke Volume x Heart Rate. o Autonomic Control of the Heart Chronotrophic effect - rate of the heart Inotrophic effect - cardiac contractile force Dromotrophic effect - speed of impulse transmission in the heart. Atrophy - a decrease in cell size due to a decrease in workload. Dysplasia - a change in cell size, shape, or appearance caused by an external stressor. Usually leads to cancer. o
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This note was uploaded on 10/13/2011 for the course PARAMEDIC 101 taught by Professor Bator during the Spring '11 term at Columbus State Community College.

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Chapter 28 - Chapter 28 Part 1 Cardiology Cardiology the...

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