Fig. 1.

Anatomy and function of human heart. The unique structure of the heart's strong muscle and large/small blood vessel that closely merge together as one is the mechanical force and energy basis for the human body in performing various physiological activities. In particular, the striated muscle fibrous tissue that undergoes autonomic contraction at the same electro-physiological rhythm is a critical feature of coordination between the left heart and the right heart, in order to efficiently handle the repeated remodeling of blood biochemistry. Coordinate icons in the lower left corner are “T” for top, “P” for posterior, “A” for anterior, “R” for right, “L” for left, “B” for bottom.