physiologic dead space
noun
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(obsolete) The volume of the conducting airways of the lung. This definition became inadequate once the alveolar dead space was described.
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(physiology) That volume of air in the lung which does not partake in gas exchange.
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(physiology) That volume of air in the lung that does not eliminate carbon dioxide, as defined functionally by the Bohr equation.
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(physiology) The sum of the anatomic plus the alveolar dead spaces.
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(physiology) The sum of the parallel and the serial dead spaces.