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Cardiovascular Disorders And Treatment Practice Test

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BNP is a marker secreted when there is too much pressure in which organ?
Correct Answer:
Heart
Explanation:
BNP is produced mainly by the ventricular myocardium in response to increased wall stress from volume or pressure overload. When the heart, especially the left ventricle, is under strain due to heart failure or elevated filling pressures, it releases BNP into the bloodstream. This makes BNP a useful biomarker for cardiac dysfunction, reflecting how hard the heart has to work to pump blood. The other organs listed don’t generate BNP in response to heart-wall stretch—the hormone is tied to cardiac pressure/volume overload, whereas the liver, lungs, and kidneys have different regulatory roles and do not release BNP as a signal of ventricular pressure.

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