Warm-blooded animals consume much more oxygen per body mass than cold-blooded animals. Which of the features below helps them in reducing moisture loss through breathing a lot of air?

Question

BlackTom AI · Accepted Answer

Nasal turbinates increase the internal surface area of the nose and provide a warm, moist mucosal surface that conserves water by reclaiming heat and humidity from exhaled air.

1. Relevant knowledge points and concepts
- Warm-blooded (endothermic) animals have high metabolic rates and therefore high ventilation rates, which can lead to substantial respiratory water loss.
- Structures that increase nasal surface area and enable countercurrent heat and moisture exchange reduce evaporative water loss during heavy breathing.
- Nasal turbinates (conchae) are scroll-like bony ridges covered with vascularized, mucous membrane that perform warming, humidifying, and moisture-reclaiming functions.

2. Step-by-step reasoning
- High oxygen demand → increased breathing volume → more moist internal respiratory surfaces exposed to air → potential for increased water loss.
- A structure that both humidifies incoming air and captures moisture from outgoing air will reduce net water loss.
- Nasal turbinates provide large, convoluted mucosal surfaces and close contact between inhaled/exhaled air and blood vessels, enabling heat and moisture transfer.

3. Mechanism details (intermediate steps)
- During inhalation: cold, dry ambient air passes over the warm, wet turbinate mucosa; the air is warmed and humidified before reaching the lung.
- During exhalation: warm, moist air leaving the lungs passes back over the cooler turbinate surfaces; water vapor condenses and heat is transferred back to the mucosa and blood.
- This countercurrent-like exchange traps moisture, returning it to the body and lowering net respiratory water loss.

4. Why the correct answer is correct
- Nasal turbinates are specifically adapted to reduce respiratory water loss by maximizing mucosal area and enabling moisture/heat recovery—precisely the function asked about.

5. Why other options are incorrect
- Filter in the trachea: mainly traps particles; does not efficiently reclaim moisture.
- Specialized tongue: may aid in feeding or thermoregulation (panting) but does not recover moisture from exhaled air.
- Lung: essential for gas exchange but has large moist surfaces that can increase water loss; lungs don’t have the same moisture-recovery mechanism as turbinates.

6. Conclusion
Nasal turbinates are the anatomical feature that helps warm-blooded animals reduce moisture loss during heavy breathing. This matches the provided answer: Nasal turbinates.

Warm-blooded animals consume much more oxygen per body mass than cold-blooded animals. Which of the features below helps them in reducing moisture loss through breathing a lot of air?单项选择题

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