Which of the following is NOT a response of the sympathetic nervous system?

The sympathetic nervous system is part of the autonomic nervous system that prepares the body for 'fight or flight' responses during stressful situations. It is characterized by several physiological changes that enhance the body’s ability to deal with immediate threats.

An increase in heart rate is crucial for pumping more blood (and hence oxygen) to the muscles and vital organs. Pupil dilation allows for improved vision in low-light conditions, which may be necessary in a threatening situation. Additionally, the inhibition of digestion is a typical response, as energy is redirected away from non-essential functions like digestion to support immediate physical demands.

In contrast, increased salivation is not a response associated with the sympathetic nervous system. During stress, the body prioritizes survival-focused processes, which means that functions related to digestion, including salivation, are reduced. This makes option C the correct answer, as it does not align with the physiological responses typical of the sympathetic nervous system.