Question

the \boxed{} 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 autonomic nervous system has two main divisions: the sympathetic (which activates the "fight - or - flight" response) and the parasympathetic. The parasympathetic nervous system is responsible for conserving energy, slowing the heart rate, and reducing blood pressure to bring the body back to a normal, resting state after a stressor has passed.

Answer:

parasympathetic