Question

Cardiac activity could be moderated by the autonomous neural system. Tick the correct answer.

• A. The parasympathetic system stimulates heart rate and stroke volume
• B. The sympathetic system stimulates heart rate and stroke volume
• C. The parasympathetic system decreases the heart rate but increase stroke volume
• D. The parasympathetic system decreases the heart rate but increase stroke volume

Answer 1

The correct option is B The sympathetic system stimulates heart rate and stroke volume

Neural signals through the sympathetic nerves can increase the rate of the heartbeat, strength of ventricular contraction and thereby stimulating the cardiac volume output. Hence, sympathetic system is involved in stimulating heart rate and stroke volume.
On the other hand, parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.