Qi and blood here refers to the functions of human body. Qi and blood are opposite, interdependent, and restrain each other. Qi is the commander of blood, blood is the mother of qi, qi in motion keeps the blood circulating, stagnation of qi will cause blood stasis, blood can produce qi, qi can ommand blood. Qi and blood move among the channels and collaterals to nourish internal organs and the whole body.

1. The heaven is above and the earth is below all things. The relationship between yin and yang is like that between blood and qi, and a man and a woman.
2. By nature, water is cold and fire is warm. They are examples of yin and yang.
3. So yin and yang are correlated.
4. Yin exists within yang as its core. Yang is employed by yin.
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