🏥 USMLE Exam Prep

The Frank-Starling mechanism describes:

A Nerve conduction in the heart
B The heart ability to increase contractile force when ventricular filling (preload) increases
C Valve function
D Coronary blood flow

✓ Correct Answer: Option B

Frank-Starling law: increased preload (ventricular EDV) → increased sarcomere stretch → greater contractile force → increased stroke volume. Intrinsic cardiac regulation mechanism.

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