Question

Respiratory system of animals must always be moist? why

Answer 1

Animals cannot maintain gas exchange by diffusion across their outer surface. They developed a variety of respiratory surfaces  that all increase the surface area for exchange, thus allowing for larger bodies. A respiratory surface is covered with thin, moist epithelial cells that allow oxygen and carbon dioxide to exchange. Those gases can only cross cell membranes when they are dissolved in water or an aqueous solution, thus respiratory surfaces must be moist..


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Answer 2

The most surface of the respiratory system of the mammals helps them in gaseous exchange. The more the ‘surface area’ of the bronchioles more is the amount of oxygen absorbed in the body.  

Explanation:

• Also as oxygen is soluble in water the moist surface helps oxygen to be partially observed in the water in a higher proportion as compared to normal air.  

• As a result the amount of oxygen in air is 20% where is the ‘amount of oxygen’ in the most surface is more than 20%.

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