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Mediastinum
the space at the center of the chest that contains the heart and the great vessels
Visceral pericardium
The inner layer of the pericardium
Parietal pericardium
The outer layer of the pericardium
Purpose of Valves
Ensure the flow of blood in one direction, prevent backflow
The first heart sound (Lub)
is due to the closure of the atrioventricular valves.
The second heart sound (Dub)
is caused by the closure of the aortic & pulmonic
A third heart sound may be heard in:
Athletes & children due to turbulence of blood flow
3 parts of circulation
Pulmonary, systemic, coronary