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Qi (Chi) and blood flow

Traditional Chinese medical theory is completely different from western. You'll need to be quite imaginative to understand. It sees the body as composed of 12 major channels (or called meridian) through which the vital energy Qi or Chi (氣, pronounced as "chi" in mandarin, and "hey" in Cantonese)  flows and by vessels through which blood flows.

Qi and blood function differently but are related. There's a saying that "Qi leads, blood flows". This vital energy is believed to be the leader that drives the blood flow, while the blood flow helps "feed" the Qi by being its material basis. Nourishing blood and Qi is very important. Every organ in the body depends upon blood for nourishment. Using herbs to enrich the blood improves overall bodily performance by improving the functioning of all of the organs, which achieves maximum organ efficiency, better health and longevity. Likewise, by nourishing the Chi, energy levels are increased, providing greater vitality, strength, and endurance.

The channels - the meridians of acupuncture (經,pronounced as "jing" in Mandarin, and "ging" in Cantonese), and the collaterals (絡, pronounced as "law" or "luo", and "lok" in Cantonese)through which the Qi flows connect the internal organs with superficial organs and tissues, and with each other. Thus the body is an organic whole. 10 out of 12 major channels correspond to major internal organs and are considered to function in pairs. The solid, yin viscera are: heart, liver, spleen, lung and kidney. The hollow, yang bowels are: small intestine, gall bladder, stomach, large intestine, and urinary bladder. The remaining pair refer to the Pericardium (tissue surrounding the heart) and the Triple Burners, i.e. the three portions of the body cavity: above the waist; at the diaphragm and umbilicus; and below the umbilicus.

Complicated, right? These are just basics. Just imagine Chinese medicines have been developed for over 5000 years, even before modern medicine, political system, industry or technology even exist. So superstitious factors would be quite reasonable. Ancient Chinese experimenter's tried to develop medicine for immortality. Of course they failed, but instead they discover herbal formulas to strengthen their body while reducing many of the healthy problems associated with aging. In average, Chinese lives longer than many cultures, probably because of the use of herbal formulas discovered all these years. Also because of this long history of test and trial and better organized materials in modern days, TCM (Traditional Chinese Medicine) already became a science that you can learn with theories.

(sources: Streetwise Guide: Chinese Herbal Medicine by Wong Kang Ying and Martha Dahle, Chinese Herbal Medicine made easy by Thomas Richard Joiner.)