The human body is made to stay healthy, but sometimes the machine gets carried away and illnesses, allergies, amputations occur.
To live together, in common happiness, you have to feel what the other is thinking and translate it into your own language to understand it.
An exchange structure connects two distinct environments, which it is preferable to know and recognize in order to maintain the balance between the two.
An exchange structure is specific for a particular element and takes into account all the circuit traversed by this element, in the human body.
Beings have become multicellular thanks to the ability of cells to associate, with other cells or with the extra-cellular matrix.