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

The answer is parasympathetic.

Explanation:

The Parasympathetic Nervous System is one of the two divisions of the autonomic system, which is the system that regulates all our bodily functions, like heart rate and peristalsis.

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layer 3 is younger than layer 6.

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