In the denervated heart, left ventricular stroke work increases when

1.	In the denervated heart, left ventricular stroke work increases when A. The end-diastolic length of the ventricular fibres increases. B. Peripheral resistance rises. C. Blood volume falls. D. Right ventricular output increases. E. The veins constrict.
Answer» A. True As stated in the Frank–Starling Law. B. True This impedes ventricular outflow, thus increasing end-diastolic fibre length. C. False This reduces cardiac filling pressure and hence end-diastolic fibre length. D. True This tends to increase left ventricular filling pressure and end-diastolic fibre length. E. True This also raises cardiac filling pressure.

In the denervated heart, left ventricular stroke work increases when A. The end-diastolic length of the ventricular fibres increases. B. Peripheral resistance rises. C. Blood volume falls. D. Right ventricular output increases. E. The veins constrict.

Answer»

A. True As stated in the Frank–Starling Law.

B. True This impedes ventricular outflow, thus increasing end-diastolic fibre length.

C. False This reduces cardiac filling pressure and hence end-diastolic fibre length.

D. True This tends to increase left ventricular filling pressure and end-diastolic fibre length.

E. True This also raises cardiac filling pressure.

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In the denervated heart, left ventricular stroke work increases when A. The end-diastolic length of the ventricular fibres increases. B. Peripheral resistance rises. C. Blood volume falls. D. Right ventricular output increases. E. The veins constrict.

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