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GRCC AD 155 Unit II

grcc ad 155 Cardiac anatomy

Heart size hollow, cone shaped and the size of an adult fist (1 lb)
Heart location mediastinum of the thoracic cavity, between the vertebral column and the sternum.
This is flanked laterally by the lungs and lies 2/3 to the left of the sternum heart location.
Heart protective covering pericardium- snug fit helps keep it from overfilling with blood.
The pericardium is a double layer parietal pericardium & visceral pericardium (epicardium)
Parietal pericardium Outermost layer
Visceral pericardium (aka epicardium) adheres to the heart surface
Layers of the heart muscle epicardium, myocardium, endocardium
Epicardium outside layer of heart, covers entire heart and great vessels then folds over to form the parietal layer.
The epicardium covers the entire heart and great vessels, then folds over to form what? The parietal layer that lines pericardium and adheres to heart surface.
This is the middle layer of the heart wall the myocardium
the myocardium consists of specialized muscle cells (myofibrils) provides bulk of contractile heart muscle.
Innermost layer, thin membrane composed of 3 layers. endocardium
The endocardium is made up of smooth endothelial cells that line the inside of the heart's chambers and great vessels.
AV valves tricuspid on the right is seperates right atria from rt ventricle
AV valves Bicuspid on the left
Semilunar valves pulmonary and aortic
pulmonary joins rt ventricle with pulmonary artery.
Aortic joins left ventricle to the aorta.
SI sound systole
Systole = contraction (S1 sound)
what is characterized as the LUB SI (first heart sound/contraction)
What is the LUB sound produced by? the closure of the av valves (tricuspid & bicuspid)
the lub sound is when which valve closes and the action that is occuring closure of the AV valve and contraction
What is the second heart sound? S2
S2 = diastole (relaxation)
diastole relaxation
Characterized by Dub S2 - second heart sound
what is the dub sound produced by? the closure of the semilunar valves (Aortic valve, pulmonary valve)
Created by: Wends1984