The vitality from external sources or nature (bahya prana) and internal vitality (abhyantara prana) sustain human life. The vitality from external sources or nature is converted into internal vitality through channels of transportation and transformation of vitality (pranavaha srotasa) [Su.Sa.Sutra Sthana 17/13].<ref name=SU/> The vitality especially depends on blood tissue (rakta)[Cha.Sa.[[Sutra Sthana]] 24/4], essence ([[oja]]) (Chakrapani on Cha.Sa.[[Sutra Sthana]]28/4], digestion, and metabolism ([[agni]])[Cha.Sa.[[Chikitsa Sthana]]15/3,4]. It is presented through sensory and motor organs (indriya)[Cha.Sa.[[Sutra Sthana]]1/48]. | The vitality from external sources or nature (bahya prana) and internal vitality (abhyantara prana) sustain human life. The vitality from external sources or nature is converted into internal vitality through channels of transportation and transformation of vitality (pranavaha srotasa) [Su.Sa.Sutra Sthana 17/13].<ref name=SU/> The vitality especially depends on blood tissue (rakta)[Cha.Sa.[[Sutra Sthana]] 24/4], essence ([[oja]]) (Chakrapani on Cha.Sa.[[Sutra Sthana]]28/4], digestion, and metabolism ([[agni]])[Cha.Sa.[[Chikitsa Sthana]]15/3,4]. It is presented through sensory and motor organs (indriya)[Cha.Sa.[[Sutra Sthana]]1/48]. |