When activated, the sympathetic nervous system produces all of the following effects, except:

• A. Dilation of pupils
• B. Stimulation of digestive activity
• C. Release of glucose from the liver
• D. Increased heart rate

Answer: (B)

Verified step by step guidance

1. Understand that the sympathetic nervous system (SNS) is part of the autonomic nervous system responsible for the 'fight or flight' response, which prepares the body for action in stressful situations.
2. Recall the typical physiological effects of SNS activation, such as dilation of pupils to improve vision, increased heart rate to pump more blood, and release of glucose from the liver to provide energy.
3. Recognize that stimulation of digestive activity is generally associated with the parasympathetic nervous system, which promotes 'rest and digest' functions, rather than the SNS.
4. Compare each option with the known effects of the SNS: dilation of pupils, increased heart rate, and glucose release are consistent with SNS activation, while stimulation of digestive activity is not.
5. Conclude that the effect not produced by the sympathetic nervous system is stimulation of digestive activity, as it is contrary to the SNS's role in inhibiting digestion during stress.