Show the mechanism for the following elimination, assuming that it is a concerted reaction. 
Definitions:
Aortic Valve
A valve in the human heart between the left ventricle and the aorta that prevents blood from flowing back into the heart chamber after it has been ejected.
Cardiac Cycle
The sequence of events in the heart from the beginning of one heartbeat to the beginning of the next, encompassing systole and diastole phases.
Pericardium
The fibrous sac that encloses the heart, providing it with protection and a fixed position within the thorax.
Myocardium
The thick, muscular layer of the heart wall responsible for the heart's contracting action.
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