Understanding the values and origin of fundamental physical constants, one of
the grandest challenges in modern science, has been discussed in particle
physics, astronomy and cosmology. More recently, it was realised that
fundamental constants have a bio-friendly window set by life processes
involving motion and flow. This window is related to intrinsic fluid properties
such as energy and length scales in condensed matter set by fundamental
constants. Here, we discuss important extrinsic factors governing the viscosity
of complex fluids operating in life processes due to collective effects. We
show that both extrinsic and intrinsic factors affecting viscosity need to be
taken into account when estimating the bio-friendly range of fundamental
constants from life processes, and our discussion provides a straightforward
recipe for doing this. We also find that the relative role of extrinsic and
intrinsic factors depends on the range of variability of these intrinsic and
extrinsic factors. Remarkably, the viscosity of a complex fluid such as blood
with significant extrinsic effects is not far from the intrinsic viscosity
calculated using the fundamental constants only, and we discuss the reason for
this in terms of dynamics of contact points between cells.Comment: arXiv admin note: text overlap with arXiv:2307.0527