Resonance occurs when frequencies (or harmonics of frequencies) are closely-enough matched so that energy can be transferred - causing Entrainment - the frequencies shift to exactly match each other. It is not necessarily the strongest signal that entrains the other. The least mobile (least adaptive) signal - even if very weak - would entrain a more mobile signal. In biology there is also an issue of how that simple two-way relationship plays out within a vastly complex set of (other) relationships. In general the body can resonate with anything - even things that might cause disease. But it likes to resonate with whatever might bring it into more health. So - to give one example - an appreciative 10-second Heart-Rate-Variability rhythm is a very powerful force that brings about resonance between different physiological systems.

Biological integration means that there is a free transfer of information and different systems respond freely to other systems (allowing them to optimise with each other - perhaps through resonance). But as integrated processes they also retain their own capacity for independent action. Francisco Varela's "Not-One, Not-Two" duality is an integrated set of mutually supportive but also independent processes. Symbiosis is an integration that requires diversity in order to be most effective for the symbionts. Small amounts of diversity create the conditions for competition, whereas high levels of diversity (such as say, 15 species of grass and associated plants in a meadow) bring about symbiotic cooperation between what are usually competitive species[1]. Your body is effectively an integrated symbiotic collective of cells, organs, systems.

Coherence is similar to resonance - it implies some kind of shared Harmony. Coherence for the body - like resonance- is both useful and dangerous. Useful because information can be transferred without even the need for direct links (such as nerves) - such as the case of entangled biophotons produced by Myelin, or the Bose-Einstein Condensate of activity in microtubules. Imposed coherence does not allow for adaptation. Coherence in biology is more of a carrier frequency for harmonious information - rather than imposing a dangerously rigid unadaptive uniformity. The body-mind has to be coherent in the sense that all its "parts" understand that they are part of a greater whole. If this kind of coherence is missing then illness results due to the loss of physiological efficiency, the incoherent way different processes relate to each other, and the tendency for groupings outside the main coherent center of identity to have less access to immune and repair processes and more tendency to go off and do their own thing (such as cancer).

The idea of Harmony is probably as close as it gets to a simple model of a happy body-mind. In Health all the various systems work symbiotically, integrate and resonate with each other so as find the sweet spot where everything is working as efficiently as possible. One onteresting point is that there is no higher level "energy usage meter" to measure total power usage, because unlike power entering through the electricity meter on your house, energy in the body is produced all over by a vast number of separate mitochondrial colonies. If energy usage is to be optimised, this has to arise through information arising from the source of energy - the mitochontdria, the most numerous (by a factor of about 20) cellular life-form in your body. So mitochondrial activity also has to somehow be in harmony with everything else - and vice versa and have some kind of internal coherence across your entire organism. A Healthy body is a little like an orchestra so large that spills out into the street, and joins in with the street musicians and passers-by. The tune and passes to-and fro, the movement of people dancing and walking affects the orcestra just as much as the rhythm of the music affects their movements.