Which of the following is a parasympathetic nervous system response?

• A. Decreased heart rate
• B. Increased respiratory rate
• C. Increased blood pressure
• D. Dilation of pupils

Answer: (A)

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' activities, which generally conserve energy and promote maintenance functions.
2. Identify the typical responses of the parasympathetic nervous system: These include decreased heart rate, increased digestion, and constriction of pupils.
3. Analyze each option provided: Consider whether each option aligns with the 'rest and digest' functions of the parasympathetic nervous system.
4. Evaluate 'Decreased heart rate': This is a classic parasympathetic response, as it conserves energy by slowing down the heart rate.
5. Compare with other options: Increased respiratory rate, increased blood pressure, and dilation of pupils are typically associated with the sympathetic nervous system, which prepares the body for 'fight or flight' responses.