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a
Increase heart rate and the strength of ventricular contraction
b
Increase heart rate, but have no effect on the strength of ventricular contraction
c
Decrease heart rate and speed of conduction of action potential
d
Increase heart rate and decrease cardiac output
answer is A.
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Detailed Solution
Neural signals through the sympathetic nerves (part of ANS) can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.