The Frank-Starling law of the heart states that stroke volume is proportional to
a. the end-systolic volume.
b. the end-diastolic volume.
c. the afterload.
d. the heart rate.
e. contractility.

The Frank-Starling law is also named as the Starling's law. This law explains the relationship between the end-diastolic volume and stroke volume.

This law propose that the stroke volume increases with the increase in the end-diastolic volume of the heart, all other factors remain same. Hence, the stroke volume is proportional to the end-diastolic volume.

Thus, the correct answer is option (b).

The Frank-Starling law of the heart states that stroke volume is proportional to a. the end-systolic volume. b. the end-diastolic volume. c. the afterload. d. the heart rate. e. contractility.

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The Frank-Starling law of the heart states that stroke volume is proportional to
a. the end-systolic volume.
b. the end-diastolic volume.
c. the afterload.
d. the heart rate.
e. contractility.