A&P ch 19 The heart
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| The heart is a | 4 chambered muscular organ
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| What is the location of the heart | It lies in mediastinum with apex on diaphragm 2/3 of its bulk to the left of midline of body & 1/3 to right
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| How do you count apical beat | by placing stethoscope in 5th intercostal space on line with left midclavicular point
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| What is the loose-fitting inextensible sac is around the heart | fibrous pericardium
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| What is the layer that is lined with serous percadium, which also covers the outer surface of the heart | Parietal layer
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| The outer surface of the heart | Visceral Layer or Epicarduim
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| what is the small space btwn parietal & visceral layers of serous pericardium contain what? | few drops of pericardial fluid
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| What is the function of the covering | To protect against friction
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| What are the walls of the heart are ?? | epicardium, myocardium(muscular wall), endocardium (lining)
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| what allows the intercalated discs to directly contact btwn cells & muscle action potentials to spread from one fiber to another | Myocardium(muscular wall)
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| Cavaties are formed by ?? | 2 atria, 2 ventricles
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| Atria are separated by what ?? | interatrial septum which contain fossa ovalis
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| ventricles separated by ?? | interventricular septum
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| Ventricles have irregular folds called?? | Trabeculae carneae
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| Atria has folds called?? | pectinate muscles
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| What are between atria & ventricles | atrioventricular AV oriffices
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| AV is guarded by | cuspid valve
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| Cuspid valve has 3 parts?? | flaps, chordae tendinae & papillary muscle
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