The foundation of ancient Chinese medicine is “blood”. It is "blood" that enables a physician to do diagnosis (by palpation on arteries) and to do treatment (bleeding primarily the veins by sharp stones or needles). It is generally believed that during the period from 150 BC to 100 AD, several people with their name unknown systematically summarized the medical ideas available at the time primarily from BQ medicine. Their works resulted in the classic text Huandi Neijing. The Chinese physicians by Neijing era knew very well what blood (血) and blood vessel (血脉) are: “The vessels are where blood resides” (夫脉者, 血之府也) (SW 17). In Chinese language, blood vessel is “血脉”or simply just “脉”(Mai = vessel). https://www.linkedin.com/pulse/founding-father-meridian-acupuncture-how-nobel-price-nominee-cheng-3h7tc/