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Question

Which of the following types of tissue forms the thin surface for the gaseous exchange in the lungs?

A
Epithelial
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B
Connective
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C
Nervous
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D
Muscle
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Solution

The correct option is A Epithelial
Large animals cannot maintain gaseous exchange by diffusion across their outer surface. Hence, a variety of respiratory surfaces are developed in them that 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.
Hence the correct option is A.

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