Which of these is an effect of the parasympathetic nervous system?

• A. Increased heart rate
• B. Pupil dilation
• C. Stimulation of digestive activities
• D. Inhibition of salivation

Answer: (C)

Verified step by step guidance

1. Understand the role of the parasympathetic nervous system: It is part of the autonomic nervous system responsible for 'rest and digest' functions, which generally promote maintenance activities and conserve body energy.
2. Identify the effects typically associated with the parasympathetic nervous system: These include slowing the heart rate, stimulating digestive processes, and promoting salivation.
3. Analyze each option: Increased heart rate and pupil dilation are typically effects of the sympathetic nervous system, which prepares the body for 'fight or flight' responses.
4. Consider the option 'Stimulation of digestive activities': This aligns with the parasympathetic nervous system's role in enhancing digestion and nutrient absorption.
5. Evaluate the option 'Inhibition of salivation': This is contrary to the parasympathetic function, which usually stimulates salivation to aid in digestion.