Atrial Systole. The period of contraction that the heart undergoes while it pumps blood into circulation is called systole. Systole may also refer to the contraction stage of the contractile vacuole in protozoans.
Atrial diastole is the very first event of the cardiac cycle. Atrial systole occurs toward the end of ventricular diastole completing the filling of the ventricles. You can get a ventricular arrhythmia when the signals are off.
Atrial contraction is complete before the ventricle begins to contract.
The period of time that begins with contraction of the atria and ends with ventricular relaxation is known as the cardiac cycle. At the end of the atrial systole the ventricular systole starts. During early ventricular systole the ventricles. Systole may also refer to the contraction stage of the contractile vacuole in protozoans.
