What does Starling’s law of the heart describe?

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It is not applicable in hearts that are failingIt does not function during physical activityIt accounts for the rise in cardiac output caused by increased venous returnIt explains the boost in cardiac output due to stimulation of the heart's sympathetic nerves

Explanation

Starling’s law of the heart explains how an increase in venous return leads to a corresponding rise in cardiac output. It does not describe changes caused by sympathetic nerve stimulation nor is it inactive during exercise or heart failure.