Fire

The digestive enzymes and secretions, and all enzymes. Yellow Bile. The Innate Heat of Metabolism and the Digestive Fire. The heart, liver and stomach. All active, muscular heat generating tissues: the muscles. The Fire of spirit and intelligence, and the sparkle in the eyes.
In the aspects of Human Physiology, fire is attributed to tendency (rising), bodily system (liver), excretion (sweat and tears), sense (smell), bodily function (digestion, voluntary), mentality (emotional) and mental state (weeping and anger).