What biological process allows humans to maintain high body temperature?

Homeostasis.

Explanation:

Homeostasis is the process of maintenance of the constant internal body temperature. This process is controlled by thermoregulatory centre which is contained in the hypothalamus in the brain. The nervous system and hormones are responsible for this process.

Humans, birds and all mammals areendotherms which means they are animals who maintains a constant or stable body temperature by generating the heat.

When temperature rises up, the body reacts by increasing blood flow to the skin surface, taking the heat from the body to the surface. As the sweat evaporates, and body cools down.  

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

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