Q: Which part of the nervous system generally acts to conserve energy?  

Answer: D

The parasympathetic nervous system generally acts to conserve energy by promoting rest and digestion. It is responsible for activities such as decreasing heart rate, constricting pupils, increasing digestive secretions, and promoting bladder emptying. In contrast, the sympathetic nervous system, which is responsible for the body's fight or flight response, acts to expend energy by increasing heart rate, dilating pupils, decreasing digestive secretions, and promoting bladder retention. Therefore, option D is the correct answer.

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