Examples from literature

• Contraction or systole is followed by a pause or diastole during which the blood flows from the veins into the auricles. 
• Later in its action, the drug depresses the intra-cardiac motor ganglia, causing prolongation of diastole and finally arrest of the heart in dilatation. 
• Nature outside man had taught him that life on all levels takes it course in a perpetual interplay of opposites, manifested externally in an interplay of diastole and systole comparable to the process of breathing. 
• This change of the colour of the wall he well ascribes to the compression of the retina by the diastole of the artery. 
• Thus we trace the rhythmic beating of the pulse to the systole and diastole of the heart, and we note a similar alternation in the contraction and relaxation of all our muscles.