During the normal events of the cardiac cycle, which of the following statements is true?
a. Electrical depolarization follows mechan-ical contraction.
b. Electrical depolarization precedes me-chanical contraction.
c. Heart sounds precede electrical depolari-zation.
d. Heart sounds precede cardiac valve open-ing or closing.
ANS: B
The P wave signals atrial depolarization. Within 0.1 sec, the atria contract, causing a slight rise in both atrial and ventricular pressures (the A waves).
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