Prana is a Sanskrit word that refers to a vital, life-sustaining force of living beings. It is not Atman, or Soul. In Ayurveda and Yoga, it is the central concept where it is believed to flow through a network of fine subtle channels called nadis. The three main channels are: the ida (right), the pingala (left), and the sushumna (central). All physical feelings or energies that arise or flow within the body might also be interpreted as evidence that prana is at work. It can be compared to the chinese concept of chi.
Prana is also a term which can be further classified into subcategories, referred to as pranas. According to Hindu philosophy these are the vital
principles of basic energy and subtle faculties of an individual that sustain physiological processes. There are five pranas or vital currents in the Hindu system:
Prana : Responsible for the beating of the heart and breathing. Prana enters the body through the breath and is sent to every cell through the circulatory system.
Apana : Responsible for the elimination of waste products from the body through the lungs and excretory systems.
Udana : Responsible for producing sounds through the vocal apparatus, as in speaking, singing, laughing, and crying. Also it represents the conscious energy required to produce the vocal sounds corresponding to the intent of the being. Hence Samyama on udana gives the higher centers total control over the body.
Samana : Responsible for the digestion of food and cell metabolism (ie. the repair and manufacture of new cells and growth). Samana also includes the heat regulating processes of the body. Auras are projections of this current. By meditational practices one can see auras of light around every being. Yogis who do special practise on samana can produce a blazing aura at will.
Vyana : Responsible for the expansion and contraction processes of the body, eg. the voluntary muscular system.
(Adapted from
Prana - Wikipedia, the free encyclopedia)