Sentence:  Of the total cardiac cycle at this rate, <WSD>diastole</WSD> accounts for 0.50 s, or 62% of the cycle, and systole accounts for 0.31 s, or 38%. 
Meaning of the word marked with <WSD> tags:  The phase or process of relaxation and dilation of the heart chambers, between contractions, during which they fill with blood; an instance of the process.