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Understanding the values and origin of fundamental physical constants, one ofthe grandest challenges in modern science, has been discussed in particlephysics, astronomy and cosmology. More recently, it was realised thatfundamental constants have a bio-friendly window set by life processesinvolving motion and flow. This window is related to intrinsic fluid propertiessuch as energy and length scales in condensed matter set by fundamentalconstants. Here, we discuss important extrinsic factors governing the viscosityof complex fluids operating in life processes due to collective effects. Weshow that both extrinsic and intrinsic factors affecting viscosity need to betaken into account when estimating the bio-friendly range of fundamentalconstants from life processes, and our discussion provides a straightforwardrecipe for doing this. We also find that the relative role of extrinsic andintrinsic factors depends on the range of variability of these intrinsic andextrinsic factors. Remarkably, the viscosity of a complex fluid such as bloodwith significant extrinsic effects is not far from the intrinsic viscositycalculated using the fundamental constants only, and we discuss the reason forthis in terms of dynamics of contact points between cells.

Extrinsic and intrinsic effects setting viscosity in life processes: implications for fundamental physical constants