The Sympathetic System practically controls the involuntary processes, such as circulation, respiration and digestion.
The power or force transmitted from the brain to all parts of the body by means of the nerves, is known to Western science as "nerve force," although the Yogi knows it to be a manifestation of Prana.

In character and rapidity it resembles the electric current.

It will be seen that without this "nerve force" the heart cannot beat; the blood cannot circulate; the lungs cannot breathe; the various organs cannot function; in fact the machinery of the body comes to a stop without it.

Nay more, even the brain cannot think without Prana be present.
When these facts are considered, the importance of the absorption of Prana must be evident to all, and the Science of Breath assumes an importance even greater than that accorded it by Western science.
The Yogi teachings go further than does Western science, in one important feature of the Nervous System.

We allude to what Western science terms the "Solar Plexus," and which it considers as merely one of a series of certain matted nets of sympathetic nerves with their ganglia found in various parts of the body.