Increased sympathetic drive to the heart increases the A. Rate of dia

1.	Increased sympathetic drive to the heart increases the A. Rate of diastolic depolarization in sinuatrial node cells. B. Coronary blood flow. C. Rate of conduction in Purkinje tissue. D. Slope of the Frank–Starling (work versus stretch) curve of the heart. E. Ejection fraction of the left ventricle.
Answer» A. True This increases the rate of impulse generation and hence heart rate. B. True The increase in myocardial metabolism generates vasodilator metabolites. C. True Rapid spread of excitation in the ventricles results in more forceful contractions as the ventricular fibres are activated nearly simultaneously. D. True This enhances the force of contraction at any given filling pressure. E. True Due to the increased force of contraction.

Increased sympathetic drive to the heart increases the A. Rate of diastolic depolarization in sinuatrial node cells. B. Coronary blood flow. C. Rate of conduction in Purkinje tissue. D. Slope of the Frank–Starling (work versus stretch) curve of the heart. E. Ejection fraction of the left ventricle.

Answer»

A. True This increases the rate of impulse generation and hence heart rate.

B. True The increase in myocardial metabolism generates vasodilator metabolites.

C. True Rapid spread of excitation in the ventricles results in more forceful contractions as the ventricular fibres are activated nearly simultaneously.

D. True This enhances the force of contraction at any given filling pressure.

E. True Due to the increased force of contraction.

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