Which of the following would define preload?
a. Amount of force ventricles exert to open valves and eject blood
b. Degree of muscle stretch in atrium during diastole
c. Degree of stretch in ventricles before systole
d. Ejection of blood from ventricles
ANS: C
The fluid volume returning to the heart (preload) causes stretch in ventricles before systole. The more fluid there is, the greater the stretch can be.
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