Prana is considered as a central concept in Ayurveda. In Yoga it is believed that Prana flows through a network of fine channels called nadis. Its subtle material form is the breath and its most concentrated form is semen in men and vaginal fluid in women. Prana was first explained in the Upanishads. In Upanishads it is a part of the worldly, physical realm that sustains the body and the mother of thought. It fills all living forms but is not itself the individual soul. Sun and sunshine is considered as a source of Prana in Ayurveda.

Five Pranas
However in Ayurveda Prana is categorized into sub divisions which are also known as prana vayus. Prana through breath enters the body thereby to every cell. The five pranas are:
Apana : Apana is responsible for elimination of waste products from the body.
Udana : It is responsible for producing sounds through the verbal apparatus. It represents conscious energy that is required to produce the vocal sounds corresponding to the intention of the being.
Samana : It is responsible for digestion of food and cell metabolism. It also regulates the heat process of the body.
Vyana : It is responsible for expansion and contraction process of the body.

Five Upa-Pranas
The following are the five upa pranas
Naga : It is responsible for burping.
Kurma : It is responsible for blinking.
Devadatta : Devadatta is responsible for yawning.
Krikala : Krikala is responsible for Sneezing.
Dhananjaya : Dhananjaya is responsible for opening and closing of heart valves.

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