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The heart

Pericardium double- walled sac around the heart Purpose: protect and anchor; prevents overfilling; allows it to work in friction-free environment
Three layers of heart wall? Epicardium, Myocardium, Endocardium
Vessels that return blood to the heart? Superior vena cava, Inferior vena cava, Right pulmonary vein, Left pulmonary vein
Vessels away from the heart? Pulmonary trunk>>>branches into R & L pulmonary arteries Ascending Aorta>>> branches into 3 Brachial Left common artery Subclavian artery
Arteries Carry blood away from heart; Oxygenated blood
Veins Carry blood to the heart; Deoxygenated blood
Atria Receiving chambers of the heart; Blood enters the right atria from superior vena cava & inferior vena cava left atria to pulmonary veins
Ventricles Decharging chambers; Right ventricle pumps blood into pulmonary trunk Left ventricle pumps into aorta
Blood Flow 1. R atrium to tricuspid valve to R ventricle to Pulmonary Valve;Then to Pulmonary arteries straight to the lungs; When comes back from lungs goes to Pulmonary veins; L Atrium to Bicuspid valve; L ventricle to aortic; Aorta to the rest of the body
Heart valves( AV Valves) Lie between atrium and ventricles; Prevents backflow into the atria when ventricles contract; Unidirectional(moving one way) Ex: Tricuspid & Bicuspid valve
Heart Valves( Semilunar Valves) Prevent backflow into the associated ventricles Ex: Aortic & Pulmonary
ECG Required electrical activity
P wave 1st; refers to depolarization of SA node
SA Node The heart's pacemaker
QRS Vertical depolarization
T-wave Vertical Repolarization
Articular repolarization This is masked by QRS
Heart sounds Lub-dup
Lub AV valves closed; signifies the beginning of systole
Dup occurs when SL valves closed; results in diastole
Systole muscle contraction
Dyastole muscle relaxed
Created by: taejaray16