Within a physiologic range, what does an increase in left ventricular end-diastolic volume (preload) result in?
A)Increase in force of contraction
B)Decrease in refractory time
C)Increase in afterload
D)Decrease in repolarization

Question

Quizplus · Accepted Answer

This concept is expressed in the Frank-Starling law; the cardiac muscle, like other muscles, increases its strength of contraction when it is stretched. An inotropic substance would increase the force of contraction and consist of hormones, neurotransmitters, or medications, and do not include volume. Afterload is the force against which the heart must pump. A decrease in repolarization would affect electrical activity.

Within a Physiologic Range, What Does an Increase in Left