The human body uses only three modes of operation to stay in balance: activation, inhibition, apoptosis.
The visual system travels through time and space to understand the immensity of life.
The endocrine system is the art of acting at a long distance, in a targeted way using a multitude of diverse and varied molecules.
To succeed in a long process, each step must be carried out in a specific place and order, the gastro-intestinal system has been preparing for it since embryogenesis.
It is the affinity of the molecules between them which allows the cell, to react in an appropriate way to a signal, or not to react.