Which division of the autonomic nervous system calms the body, conserving energy?

Which division of the autonomic nervous system calms the body, conserving energy?

• A. Parasympathetic nervous system
• B. Sympathetic nervous system
• C. Central nervous system
• D. Somatic nervous system

Answer: (A)

The main idea here is which part of the autonomic nervous system promotes calm and energy conservation. The parasympathetic nervous system handles rest-and-digest functions. It slows the heart rate, supports digestion, and promotes storage of energy, helping the body relax and conserve resources after a meal or during quiet states. The sympathetic nervous system, in contrast, gears the body up for action—speeding the heart, widening airways, and diverting energy to muscles for fight-or-flight. The central nervous system refers to the brain and spinal cord, which process information but aren’t the specific division that calms the body. The somatic nervous system controls voluntary movements and conscious sensation, not autonomic rest-and-digest processes. So, the calming, energy-conserving division is the parasympathetic nervous system.

The main idea here is which part of the autonomic nervous system promotes calm and energy conservation. The parasympathetic nervous system handles rest-and-digest functions. It slows the heart rate, supports digestion, and promotes storage of energy, helping the body relax and conserve resources after a meal or during quiet states.

The sympathetic nervous system, in contrast, gears the body up for action—speeding the heart, widening airways, and diverting energy to muscles for fight-or-flight. The central nervous system refers to the brain and spinal cord, which process information but aren’t the specific division that calms the body. The somatic nervous system controls voluntary movements and conscious sensation, not autonomic rest-and-digest processes.

So, the calming, energy-conserving division is the parasympathetic nervous system.