Literally means the source. It is a canal for nutrition in the body. All the dhatus have their own minute channels or srotas made up of extremely fine pores, originating from the heart cavity, and spreading throughout the body; they transport the nutrient fluid to all parts of the body for nourishment and growth.

1. Structural or Functional Channels meant for the transportation of Dhatus undergoing transformation. 2. Appearance of a Srotas is similar to the Dhatu that it transports. 2. They are of two types: Sthūla (macro) and Aṇu (micro).