Qi can also directly transform into fluids [body fluid], and fluids into qi, as happens when nutritive qi secretes sweat, or when the qi of the organs [qi of the internal organs] produce their respective fluids (as discussed in Chapter 2), or when the final qi transformation occurs in the Urinary Bladder, when the last remaining clear portion of the fluids is transformed into qi by the vaporizing action of the warming yuan qi of the San Jiao, 'which then rises to warm and nourish the tissues of the zang-fu (zang fu zu zhi)'.