Starling's law of the heard________________?
Correct answer: A. Explains the increase in cardiac output that occurs when venous return is increased
- A. Explains the increase in cardiac output that occurs when venous return is increased
- B. Does not operate during exercise
- C. Does not operate in the failing heart
- D. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated
Explanation
The Frank-Starling law states that greater venous return stretches ventricular fibres and increases the force of contraction, thereby increasing cardiac output. This is an intrinsic mechanism and is distinct from sympathetic stimulation.
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