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tongue, taste; nose, smell; skin, tactile sensation. The organs of action controlled by udana are three: hands, feet and speech. The other two, the excretory and reproductive organs, are under the control of apana.
Udana also assists prana in inhalation and exhalation, intake of food and drink, as well as vomiting, spitting and swallowing saliva. All the functions of the throat and mouth are sustained by udana and its influence begins from the region of vishuddhi chakra. It also maintains the pranic link between the heart and the brain. In addition, udana aids the minor pranas (see below) in carrying out their activities due to its close proximity to them. All the five minor pranas function due to the energy derived from udana.
Udana sustains the sense organs and their activities. The enjoyment of senses keeps udana active, because it functions according to their needs. The force of udana keeps the body upright; it is responsible for anti-gravitational activities of the body (particularly by the hands and the feet).
Subtle level: Udana allows one to perform positive mental work. It is responsible for sweet, melodious and impressive speech. It allows for the exchange of prana between the head and heart, thereby establishing contact between the subtle and causal bodies. It maintains the relationship between the gross, subtle and causal bodies. Udana is experienced as spiralling flows of light down the arms and legs and up through the head.
Udana pervades ajna, bindu and sahasrara chakras. It brings energy up the koshas from the gross to the subtle. When the yogi fixes his attention on udana, he becomes free from hunger, thirst, sleep and drowsiness. The activity of udana becomes extremely slow and subtle during meditation and samadhi.
Indications of imbalance: An irregular udana causes breathing troubles, inefficiency in physical and mental work, inability to think clearly or express oneself, uncoordinated speech, weakened will and lack of cheer.
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