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Respiratory Membrane
A thin boundary comprising the alveolar and capillary walls where gas exchange between air and blood takes place in the lungs.
Diffusion
The movement of molecules or particles from regions of higher concentration to regions of lower concentration.
Physiological Dead Air Space
The volume of the airways where gas exchange does not occur, including parts of the bronchial tree and trachea.
Anatomic Dead Space
The portion of the respiratory system where gas exchange does not occur, including the nose, trachea, and bronchi, where air is moved in and out without being involved in oxygen/carbon dioxide exchange.
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