One complete heartbeat, seen on the ECG as a P wave, a QRS complex and a T wave. In a normal cardiac cycle, the atria depolarize and contract, delivering blood into the relaxed ventricles (P wave); the atria repolarize and relax while the ventricles, now filled to capacity with blood, contract and pump blood into the systemic and pulmonary circulation systems (QRS complex). After the ventricular contraction, the ventricles repolarize and relax (T wave). The cycle begins again at the end of ventricular repolarization with the onset of passive ventricular filling.
one complete cycle of the three stages of heart action.
describes all the activities of the heart through one complete heartbeat - that is, through one contraction and relaxation of both the atria and the ventricles.
One complete heartbeat, including atrial and ventricular systole and diastole.
the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse in conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles; "the cardiac cycle can be shown on an electrocardiogram"
The sequence of contraction and relaxation that makes up the heartbeat. 720
The pumping of the heart is called the Cardiac Cycle, which occurs about 72 times per minute.
A beat of the heart, encompassing activation of the atria and ventricles. Note that in dysrhythmic regimes, Cardiac Cycles may be difficult to define, though individual myocardial cells will still exhibit clear activation/recovery cycles.
One heartbeat; consists of atrial contraction and relaxation, ventricular contraction and relaxation, and a short pause.
One complete heart beat, contraction and relaxation. Normally takes about 0.85 seconds.
Period from the beginning of one heartbeat to the beginning of the next.
The cycle of activities associated with one heartbeat.
One total heartbeat, one complete contraction and relaxation of the heart.
Cardiac cycle is the term used to describe the sequence of events that occur as a heart works to pump blood through the body. The frequency of the cardiac cycle is the heart rate.