Question

the blank nervous system is a part of the autonomic system that conserves energy by returning the body to a normal activity level through a lowered heart rate and blood pressure.

Explanation:

The question is about the nervous system, specifically the part of the autonomic nervous system that conserves energy. In the autonomic nervous system, the parasympathetic nervous system is responsible for "rest and digest" functions, which include lowering heart rate and blood pressure to return the body to normal activity levels and conserve energy.

Answer:

parasympathetic