Why should animals regulate body temperatures?

The body temperature must be kept constant because enzymes work best at specific optimum temperature. For instance, human body temperature is about 36.9⁰C which is the optimum temperature for its enzymes.  At high temperature above 40⁰C enzymes are denatured or too low temperatures lead to slowing of metabolic activities and impairing the activities of important organs such as the brain.

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Dr. Bbosa Science