傳統醫學陰陽與副交感（一氧化氮-環鳥苷酸）以及交感（一氧化碳-環腺苷酸）平衡

Yin-Yang in Traditional Medicine and Its Relation to Parasympathetic (NO-cGMP) and Sympathetic (CO-cAMP) Balance

陰陽為傳統中國醫學之要素。在此論文，我解釋陰陽的概念與副交感和交感神經系統之關係。我們的身體用交感和副交感系統來做平衡。陰與副交感神經有關而陽與交感神經有關。此外，存在有二級傳導物質與陰陽相符合。副交感神經由一氧化氮及cGMP來媒介而交感神經則透過一氧化碳及cAMP來媒介。一氧化氮和一氧化碳是疏水性二級傳導物質而cGMP和cAMP是親水性二級傳導物質。

Yin-Yang is a key concept in traditional Chinese medicine. In this paper I explain the relationship of Yin-Yang and the parasympathetic and sympathetic system. Our body uses both the sympathetic and the parasympathetic system to balance our body. Yin is related to the parasympathetic system, and Yang is related to the sympathetic system. In addition, there are also secondary messenger systems which match Yin-Yang. The parasympathetic system is mediated by NO-cGMP, and the sympathetic system is mediated by CO-cAMP. NO & CO are hydrophobic secondary messengers, and cGMP & cAMP are hydrophilic secondary messengers.