Heart2 - CIRCULATORY SYSTEM HEART EXTERNAL HEART...

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CIRCULATORY SYSTEM: HEART
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EXTERNAL HEART ANATOMY (Anterior) Atrioventricular sulcus
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EXTERNAL HEART ANATOMY (Posterior)
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CORONARY ARTERIES Left coronary artery anterior interventricular artery supplies interventricular septum + anterior walls of ventricles circumflex artery supplies left atrium and posterior wall of left ventricle Right coronary artery marginal artery supplies lateral right atrium + ventricle posterior interventricular artery supplies posterior walls of ventricles
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CARDIAC VEINS 1. Great cardiac vein in anterior interventricular sulcus 2. Middle cardiac vein in posterior sulcus Coronary sinus in posterior coronary sulcus collects blood from the veins and empties into right atrium 20% venous drainage occurs directly into right ventricle & 80% returns to right atrium
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CORONARY FLOW Reduced during ventricular contraction coronary arteries are compressed Increased during ventricular relaxation openings to coronary arteries above the aortic semilunar valve, fill as blood flows back to the valve
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CARDIAC MUSCLE Cells are branched with one central nucleus. T tubules of sarcoplasmic reticulum are large. Intercalated discs, join myocytes end to end. interdigitating folds increase surface area mechanical junctions tightly join myocytes electrical junctions (gap junctions) form channels allowing ions to flow directly into adjoining cell
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ELECTROCADIOGRAM (ECG) Useful for diagnosing: abnormalities in conduction pathways MI heart enlargement electrolyte and hormone imbalances
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Normal Electrocardiogram
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ELECTROCADIOGRAM
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