The actual site of gas exchange in the mammalian respiratory system is:

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The alveoli are the terminal, microscopic, thin-walled, highly vascularized air sacs in the lungs. They are the primary and actual sites of gas exchange, where oxygen diffuses from the inhaled air into the blood, and carbon dioxide diffuses from the blood into the alveolar air to be exhaled. Their large surface area and thin walls facilitate this diffusion.

The actual site of gas exchange in the mammalian respiratory system is: MCQ with Answer and Explanation

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