An increase in sympathetic input and a decrease in parasympathetic (vagal) input to the heart causes
A) the pacemaker to produce action potentials more quickly.
B) an increase in the speed of contraction through the atrioventricular node.
C) an increase to the force of ventricular contraction.
D) an increase in contraction of peripheral arteries.
E) All of the answers are correct.

Question

Quizplus · Accepted Answer

An increase in sympathetic input and a decrease in parasympathetic input to the heart results in an increase in heart rate (pacemaker producing action potentials more quickly), an increase in the speed of conduction through the atrioventricular node, an increase in the force of ventricular contraction, and an increase in the contraction of peripheral arteries. These effects collectively enhance cardiac output and blood pressure.

An Increase in Sympathetic Input and a Decrease in Parasympathetic