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A&P ch 19 The heart

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



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