If you abstract enough, anything cam be considered as a computational device. The issue with doing this with cells is the sheer number of variables.
For any given cell, the following internal variables exist:
* Internal ion concentrations for dozens of ions of importance importance
* Internal concentrations of hundreds or thousands of various simple organic molecules, including "raw" internalised molecules, various steps in dozens or even hundreds of metabolic processes, and metabolic end-products and by-products.
* Internal concentrations of hundreds or thousands of different proteins and other complex biological "mechanical parts", as well as the states of these "parts".
* The physical state of the cell - stretched, contracted, relaxed, hot, cold, etc.
This list is not exhaustive.
It's also worth noting that the above variables may also exist for multiple separate "compartments" within the cell; vesicles, the endoplasmic reticulum and the golgi apparatus being three which come to mind immediately.
The other issue is that cells do not exist in a vacuum; the external environment plays an important role in their functioning. The human body is at any one moment existing in direct contact and interaction with the following extracellular environments:
* The atmosphere (Mainly, but not only, temperature exchange)
* The air within the respiratory system, including nose and mouth
* Stomach contents
* Small intestine contents (which would need to be considered in several segements, since the nature of the interaction changes along the path of the small intestine.
* Large intestine contents
* Blood
* Cerebrospinal fluid (Fluid found "inside" the brain)
* Extracellular fluid, or "tissue fluid" (A separate compartment for each small swatch of tissue in the body)
* Lymph
* Pleural fluid (Fluid surrounding the lungs; a separate compartment for each lung)
* Pericardial fluid (A small amount of fluid surrounding the heart)
* Joint capsule contents (A separate compartment for each joint)
...and the list goes on. Each of these compartments requires tracking of the same variables as individual cells.
This is yet further complicated by the fact that some of these compartments can't easily be considered as one big compartment, because of the importance of spatial relations. For example, the oxygen and carbon dioxide concentrations of blood (as well as the concentrations of other substances like alcohol) change centimeter-to-centimeter. 279
Yet another issue is the fact that cells are not static in terms of their relations to each other; red blood cells move with blood flow, and experience turbulence and other effects, and other cells (like macrophages) are capable of "deliberate" movement in the blood and in tissue.
You would also have to account for physical disturbances - things like a stab wound or even a pinprick are ludicrously complex at a cellular level.
Of course, human beings are very complex organisms, and there exist much simpler organisms. You might be interested in OpenWorm, which is an attempt to computationally simulate Caenorhabditis elegans, a species of roundworm, at a cellular level. Doing so even for an organism as simple as C. elegans is a massive undertaking, as evidenced by the fact that even with the contributions of dozens of experts in their fields the project has been ongoing for some time and is yet to reach stage one.
The short version: Is it possible? Perhaps. Is it easy? Definitely not. 225