Reptiles diet effects

Reptiles like the snake and the lizard cannot regulate their body temperature, and adopt the temperature of their environment (i.e., they are poikilother-mic) - so they cannot survive extremes which put their body cells, and particularly their enzyme systems, at risk. By contrast, we can shiver or sweat to increase or reduce our core temperature, and so human beings can function effectively in a much wider range of temperature than can reptiles. What has this to do with drugs and other ingested chemicals In just the same way as we mammals have evolved to be relatively independent of environmental temperature so we also have developed a system of screening and filtering out chemical substances that present themselves to us in our diet and from other sources. 

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