Tsa, 'channel' means hollow tube where blood, wind and consciousness can pass freely, for example body cavities such as blood vessels, the mouth and hollow organs. artery, vein, nerve.
Tsa is a symbol of space, and it gives space to the consciousness and other components of body/mind to manifest themselves under transcendental and dualistic forms and colors.
Nadi. The channels in the vajra body through which the energy currents move.
Channels; rtsa (Tib).
The human body contains 72,000 subtle channels or nadis which carry energy throughout the body.
The energy which flows through these channels affects every aspect of our physical and emotional well-being.
The nature of the energy and its circulation depends largely on our states of mind There are three main channels, which extend from the top of the head to the groin area.