What is Upper critical temperature?

What is Upper critical temperature?

The upper critical temperature (29⁰C for man) is the environment temperature above which physical mechanism such as sweating, lowering hair cannot maintain body temperature.

The upper critical temperatures are lower for arctic mammals (e.g. Eskimo dog, white fox) than for tropical mammals such as man

When the environmental temperature rises above the upper critical temperature, the basal metabolic rate increases due to increase in body temperature and enzymatic controlled reaction up to the upper lethal temperature above which enzymes are denatured and the organism dies.

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