The movements of the body are first generated from the heart, and all the activities of the body are made possible by the senses, powered by the ten kinds of air within the body. The ten kinds of air are described as follows: The main air passing through the nose in breathing is called prana. The air which passes through the rectum as evacuated bodily air is called apana. The air which adjusts the foodstuff within the stomach and which sometimes sounds as belching is called samana. The air which passes through the throat and the stoppage of which constitutes suffocation is called the udana air. Aid the total air which circulates throughout the entire body is called the vyana air. Subtler than these five airs, there are others also. That which facilitates the opening of the eyes, mouth, etc., is called naga air. The air which increases appetite is called krkara air. The air which helps contraction is called kurma air. The air which helps relaxation by opening the mouth wide (in yawning) is called devadatta air, and the air which helps sustenance is called dhananjaya air.   (More...)