The heart is situated in the thorax and the main physiological functions of heart are: dominating the blood and vessels, opening into the tongue and, supporting the mind. The blood circulation relies on the cooperation between the heart and the vessels, dominating the blood and vessels means that the heart is the motive force for blood circulation, whilst the vessels are the physical structures which contain and circulate the blood. With the heart being of primary importance. Supporting the mind means thinking is related to the physiological functions of the heart. The tongue is connected to the Heart Meridian internally, and via this connection the heart dominates.
