Hyperthermia: a medical condition where an individual’s body temperature is elevated beyond normal Hypothermia: a medical doncition that occurs when an individual’s body loses heat faster than it can produce heat, causing a dangerously low body temperature Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different Denaturation: the alteration of a protein shape through some form of external stress (for example, heat), so that it can no longer carry out its cellular function