The strength of contraction of left ventricular muscle increases when�

1.	The strength of contraction of left ventricular muscle increases when A. End-diastolic ventricular filling pressure rises. B. Serum potassium levels rise. C. Blood calcium levels fall.D. Strenuous exercise is undertaken. E. Peripheral resistance is increased as in hypertension.
Answer» A. True As seen in the Frank–Starling left ventricular function curve. B. False High K⁺ levels decrease cardiac contractility. C. False Calcium channel blockers decrease cardiac contractility. D. True Due to increased sympathetic drive to the ventricles and increased venous return. E. True Initially by increased ventricular filling: later by ventricular hypertrophy.

The strength of contraction of left ventricular muscle increases when A. End-diastolic ventricular filling pressure rises. B. Serum potassium levels rise. C. Blood calcium levels fall.D. Strenuous exercise is undertaken. E. Peripheral resistance is increased as in hypertension.

Answer»

A. True As seen in the Frank–Starling left ventricular function curve.

B. False High K⁺ levels decrease cardiac contractility.

C. False Calcium channel blockers decrease cardiac contractility.

D. True Due to increased sympathetic drive to the ventricles and increased venous return.

E. True Initially by increased ventricular filling: later by ventricular hypertrophy.

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The strength of contraction of left ventricular muscle increases when A. End-diastolic ventricular filling pressure rises. B. Serum potassium levels rise. C. Blood calcium levels fall.D. Strenuous exercise is undertaken. E. Peripheral resistance is increased as in hypertension.

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