What function is primarily associated with the Parasympathetic Nerves?

The function primarily associated with the parasympathetic nerves is to slow the heart rate and increase intestinal activity. The parasympathetic nervous system is a part of the autonomic nervous system that focuses on conserving energy and restoring the body to a state of calm after periods of stress or activity. When activated, it promotes relaxation and helps the body to digest food effectively, leading to increased intestinal activity.

By slowing the heart rate, it ensures that the body is not in a constant state of heightened alertness, allowing for recovery and maintenance of bodily functions. This reflects the "rest and digest" response, contrasting with the sympathetic nervous system, which prepares the body for "fight or flight" situations.

The other options describe functions more closely associated with the sympathetic nervous system or do not accurately reflect the main actions of the parasympathetic system.