Which of the following is a uniquely sympathetic function?

• A. Salivation
• B. Increased heart rate
• C. Constriction of pupils
• D. Stimulation of digestive enzymes

Answer: (B)

Verified step by step guidance

1. Understand the role of the sympathetic nervous system: It is part of the autonomic nervous system responsible for the 'fight or flight' response, preparing the body for stressful or emergency situations.
2. Identify the functions typically associated with the sympathetic nervous system: These include increased heart rate, dilation of pupils, and inhibition of digestive processes.
3. Analyze each option: Salivation and stimulation of digestive enzymes are generally associated with the parasympathetic nervous system, which promotes 'rest and digest' functions.
4. Consider the physiological effects: Constriction of pupils is not a sympathetic function; rather, pupil dilation is associated with sympathetic activation.
5. Conclude by identifying the uniquely sympathetic function: Increased heart rate is a classic response of the sympathetic nervous system, preparing the body for action.