Question

The sympathetic nervous system when stimulates results in all of the following except?

increased heart rate

decreased digestion

pupil constriction

increased blood flow to muscles

Answer 1

The sympathetic nervous system when stimulates results in all of the following except :-

(c) Pupil constriction

Sympathetic nervous system causes pupil dilatation not constriction.

When sympathetic nervous system is stimulated it causes the contraction of the radial muscle and subsequent dilation of the pupil.

Pupil constriction takes place when there is contraction of circular muscles which is caused by parasympathetic stimulation.

The other options are true about sympathetic stimulation that it results in increased heart rate (positive chronotropy), decreased digestion by inhibiting gastrointestinal secretions & motor activity and increased blood flow to the muscles.

Since all options are true about sympathetic stimulation except option (c).

Thus the answer is (c) Pupil constriction.