The respiratory membrane separates the air in the alveoli from the blood in the vessels.

Question

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The respiratory membrane is a thin layer of tissue that consists of the walls of the alveoli, the capillary walls, and their basement membranes. It is responsible for the exchange of gases (oxygen and carbon dioxide) between the air in the lungs and the blood in the vessels. Thus, it separates the air in the alveoli from the blood in the vessels.

The Respiratory Membrane Separates the Air in the Alveoli from the Blood