Cardiac activity could be moderated by the autonomous neural system. Trick 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 sympathetic system decreases the heart rate but increase stroke volume.
Option B.Cardiac activity could be moderated by the autonomous neural system. The action of sympathetic nerve fibres increases the heart rate and the stroke volume, while that of the parasympathetic nerve fibres decrease these. Thus, the correct answer is 'The sympathetic system stimulates heart rate and stroke volume.'
