The MAIN cause of the shortening of ventricular contraction under sympathetic control is . . .

Question

The  MAIN  cause of the shortening of ventricular contraction under sympathetic control is . . .

Accepted Answer

accelerated inactivation of Ca channels and phosphorylation of phospholamban

Answer

direct activation of repolarizing K currents

Answer

activation of the pacemaker current

Answer

increased impulse conduction velocity

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