The higher animals have special organs for exchange of gases as their skin is ___________ ?
Correct answer: B. Thick
- A. Thin
- B. Thick
- C. Soft
- D. Hard
Explanation
In higher animals, the skin is relatively thick and is not sufficient for rapid diffusion over the whole body, so specialised respiratory organs are needed. Students may choose thin because gases diffuse through thin surfaces, but that describes an efficient respiratory surface rather than the general skin of higher animals.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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