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User __________ is the process of determining whether some user or some application or process acting on behalf of a user is, in fact, who or what it declares itself to be.
Semilunar Valves
Heart valves located at the exits of the right and left ventricles of the heart, preventing backflow of blood into the ventricles; includes the aortic and pulmonary valves.
Ventricular Diastole
is a phase of the heart cycle during which the ventricles relax and fill with blood following contraction.
Cardiac Cycle
The sequence of events that occur in the heart during one heartbeat, involving contraction and relaxation of the atria and ventricles.
Ventricular Depolarization
The electrical activity that triggers contraction of the ventricles, the heart's lower chambers, during the cardiac cycle.
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