In endocrinology course, I learned that the human body is regulated on a basis. There are a total of 12 meridians and 8 extraordinary meridians.The hand itself has 2-3 meridians.
The movement of the meridians function similarly to the circadian rhythm governed by the hypothalamus. The flow is localized at specific organs depending on the time. This principle reminds me of the biological clock government by the innate circadian rhythm. Perhaps these two concepts are related?