Just as the Earth is comprised of land, ocean and atmosphere, so the body is organized as [Blood], [Moisture] and [Qi]. [Blood] governs tissue, the material form of the body. [Moisture] governs the internal environment, the body's inner ocean. [Qi] governs the shape and activity of the body and its process of forming and organizing itself. [Qi] is the motive force that establishes respiration. This enables the [Qi] of the air to enter the body. The essentce of food is also a form of [Qi]. When the [Qi] of food and the [Qi] of air enter the body, they become one entity known as "pure" or 'righteous" [Qi]. [Air Qi] represents the immaterial motivating aspect of [Qi] and [Food Qi] the material or constructing aspect.
[Qi] has many aspects; good health depends on the presence and action of five [Qi] which are associated with different parts and functions of the body: [Organ Qi] ( [zang-fu-zhi-Qi]), [Meridian] [Qi] ( [Jing-luo-zhi-Qi]), nutritive [Qi] ( [yong-Qi]), protective (defensive) [Qi] ( [wei-Qi]) and ancestral [Qi] ([Qi] of the chest ([zong-Qi]) or essential energy). Both nutritive [Qi] and protective [Qi] are transformations of ancestral [Qi]. The guardians of ancestral [Qi] (or congenital [Qi]) are the [Kidney]. Patterns of [Qi] disharmony are therefore very numerous. There are two major patterns of disharmony associated with [Qi]: deficient [Qi] (affecting the whole body, as in the case of lethargy) and stagnant [Qi] (as in the case of aches and pains).
Every [Organ] has its own [Qi]. If this [Qi] is deficient or stagnant, this can result in disharmonies of the [Organ]. Deficient [Lung] [Qi] may predispose a person to catching colds, for example. Meridian [Qi] is [Qi] moving along the [Meridians] throughout the body. Blockages can result in deficient [Qi] to the [Organs] and symptoms of stagnant [Qi]. Nutritive [Qi] moves the [Blood] through the [Blood Vessels] to nourish the body. Protective [Qi] is what combats external pernicious influences, such as weather, pathogenic organisms or pollutants, and corresponding somewhat in western medicine to the immune system. [Qi] of the chest, or ancestral [Qi], moves the breath, the [Lung] and the [Heart].