I have been studying anatomy, and on/off gassing all relates to diffusion of gas molecules through the tissues. I'm pretty sure that the tables account for all tissues, because you can't base everything off of the tissue with slowest diffusion, or the tissue with fastest diffusion. Tissues include; bone (bone is a mineralized connective tissue, don't forget that bone is porous and still goes through diffusion and changes in partial pressures; do your bones hurt when barometric pressures change? think about that), connective tissue, blood, muscle, epithelial, and nervous tissue. These are the 4 basic tissues. Things like hair and outer skin cell layers don't matter. Basically, the way dive tables were calculated, the depth and pressure and type of gas affect each type of tissue and the rates of diffusion for each tissue were calculated, and then averaged for the average person. Some tissues don't pressurize quickly, while others do. That is what dive tables account for, as well as DSAT and Z+ and other algorithms in dive computers do. If dive tables were based off of only blood for example, which has very fast on/off gassing, then decompression in itself wouldn't exist; just surfacing slower than 30 feet per minute would be sufficient to de-saturate blood. But if dive tables were based off of bone only, then you can stay under water for hours doing decompression. That is also why there is an NDL, because with increasing pressures, diffusion happens quicker, and tissues will become more saturated faster. NDL's are based off of the depth, pressure, and gas mix (some gasses also diffuse faster than other gasses, helium is a noble gas therefore it is not included in metabolic processes, and diffuses faster, nitrogen is used in some metabolic processes and diffuses slower, and oxygen diffuses the slowest through tissues that aren't blood because it is involved in metabolic processes) that you are running, and once you hit that limit, then you will have to go through decompression because all 4 tissues are becoming saturated at the specific pressure, in respect to your current depth.
I myself am learning the theory behind decompression so I do not know everything. If you see that I made a mistake please let me know, but otherwise that is pretty much it to dive tables and how they relate to tissues.