《伤寒论·平脉法》
在人体内，营卫气血随呼吸出入、气息的活动而循环上下、敷布周身，故有脉的跳动。
呼吸出入，上下于中，因息游布，津液流通。
In the body, the qi, blood, blood of the defense, and nourishment circulate up and down and spread throughout the body according to the inhalation and exhalation of the breath, which causes the pulse to beat.