A dog cools itself by panting because
Correct answer: D. evaporation from the tongue and airways removes heat
- A. panting draws cold air into the lungs
- B. dogs sweat heavily from the skin
- C. panting raises the metabolic rate
- D. evaporation from the tongue and airways removes heat
Explanation
With few sweat glands, dogs rely on evaporating water from the moist surfaces of the mouth and lungs. Rapid shallow breathing maximises this evaporation without disturbing blood gases.
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