Many different translations have been proposed, none of them approximates the essence of Qi very well. Blood in Chinese Medicine has a more meaning than in Western Medicine. In Chinese Medicine, Blood is not only a red liquid circulating in the vessels, but also a vital nutrient substance in the body. Blood circulates throughout the body to nourish and moisten the various tissues and organs of the body.
Blood is also the material foundation for mental activities.
There are five Yin organs, which are heart, lung, spleen, liver, and kidney. They understood these organs from different ways. Traditional Chinese Medicine does diagnosis based on such knowledge.