The runner responds by perspiring (sweating), which lowers body temperature, it is an example of a negative feedback mechanism. This is very common in nature.
A negative feedback mechanism is a class of self-regulating system that biological systems use to maintain their homeostasis (internal equilibrium).
In this mechanism (negative feedback), an increased output inhibits the generation of a given outcome by the own biological system.
For example, humans inhibit the production of insulin hormone when its concentration is high.
Learn more about the negative feedback here:
https://brainly.com/question/4636540
