Xin and Fei
are located in the Upper Jiao. Xin
regulates Blood, and nourishes Fei
; Fei
regulates Qi, maintains respiration for oxygen exchange, and assists Xin
in propelling Blood circulation.
Fei generates pectoral Qi, which permeates through Xin
and vessels to promote Blood circulation; Xin
nourishes and maintains Fei’s
functions of respiration and the governing of Qi. “Qi regulates warmth; Blood regulates immersion.” Pectoral Qi flows between the beat of Xin
and the respiration of Fei
.