Essence of Prashna Upanishad: The Third Question:
“He who knows the sources and power of Life, the Prana, how it enters, where it lives, how it divides itself into five, how it is related to the Self, attains immortality; yes attains immortality”
Prana as a whole is composed of five Pranas (prana, udana, vyana, samana, apana.