I have read something about why we die from too high or too low body temperature but have always found only general reasons. For example, that the liver fails. But why does the liver fail?
I would like to know the most fundamental reason why not possessing the appropriate body temperature can kill us. Ignoring the very extremes where it is I think obvious, such as temperatures below 0°C and above 100°C when water freezes and vaporizes.
I have supplied my reasonings below; if any reasoning here is wrong, please correct my thoughts.
As far as I understand, as the temperature changes, the speed of chemical reactions changes as well. As temperature goes up, the reactions occur faster and if the temperature decreases, the reactions slow down. So, if our body temperature changes, the speed of all reactions in our body change as well. Thus, with higher internal temperature we should just become more active, speedy and so, and with low temperature we should become slower. But that does not fit into the fact that we die from extremely high internal temperatures. So, is it that the speed of different reactions change with different rates, so the organism is not kept "in sync" and dies for that reason?
Or - as temperature changes, the volume of everything changes as well. I think that's called thermal expansion. But different materials have different rates of that process. So as our temperature changes, something inside us just literally breaks or deforms too much and we die?
So why do we (and other organisms) die from not having the right temperature?