When the outer air temperature is higher than body temperature, which of the following combination of control mechanisms is the most likely to occur?
Correct answer: D. D
- A. A
- B. B
- C. C
- D. D
Explanation
When the outer air temperature is higher than body temperature, the body's thermoregulatory response shifts to cooling mechanisms such as sweating. Sweat glands release moisture onto the skin's surface, where it evaporates, dissipating heat. Additionally, blood vessels dilate to enhance heat loss through radiation and convection, while shivering and vasoconstriction are suppressed to prevent further heat retention.
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About Thermoregulation
Thermoregulation maintains body temperature through negative feedback controlled mainly by the hypothalamus. It covers vasodilation and vasoconstriction, sweating, shivering, changes in metabolic heat production and behavioural responses, while distinguishing heat loss by radiation, conduction, convection and evaporation from temperature regulation itself.
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