This corporeal body is made of Pañcabhūta(s) (Panchabhuta; Five great elements). In the context of the functioning of Teja (fire) and Marut (wind) inside the body, comes the mention of Apāna vāyu (Apana vayu; the wind called Apana). There are five kinds of wind in the body – Prāṇa (Prana), Apāna (Apana), Udāna (Udana), Vyāna (Vyana), Samāna (Samana).
Apānavāyu resides in the flame inside the stomach, below the navel spot, at the bottom of the body, and it carries urine and stools. Teja or Agni resides in between Prāṇa and Apāna vāyu, in side the stomach and helps in the digestion of the food taken inside.
The Sādhya (Sadhya) gods, possessing great power and energy, reside on earth and in the sky. Samānavāyu is the son of this Sādhya gods. Udāna is the son of Samāna, Vyāna is the son of Udāna, Apāna is the son of Vyāna, and Prāṇa, son of Apāna. These winds function one after the other, so their relation is conceptualised allegorically as father-son relationship.