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Respiratory surface is the surface where respiratory gas exchange in an animal. Ex-lungs

Respiratory gas exchange is the diffusion of both carbon dioxide and oxygen from the capillaries to the alveoli in our lungs, and vice versa.

it is the trrminal portion of respiratory tract.the exchange of gases occures only in this part of the respiratory tract

A respiratory surface is located anywhere in an animal or human being where gas exchange occurs. A respiratory surface is located anywhere in an animal or human being where gas exchange occurs.