physiologic dead space

Noun

 * 1)  The volume of the conducting airways of the lung. This definition became inadequate once the alveolar dead space was described.
 * 2) * 1948. Ward S. Fowler, Lung Function Studies. II. The Respiratory Dead Space., J. Physiology. Vol. 154. p 406.
 * Throughout this paper, the term physiological dead space will be used to refer to the volume of the conducting airway down to the location at which a large change in gas composition occurs.
 * 1)  That volume of air in the lung which does not partake in gas exchange.
 * 2)  That volume of air in the lung that does not eliminate carbon dioxide, as defined functionally by the Bohr equation.
 * 3) * 2011. John B. West, Respiratory Physiology: The Essentials. Lippincott Williams & Wilkins; Ninth edition.
 * Bohr's method measures the volume of the lung which does not eliminate CO2. Because this is a functional measurement, the volume is called the physiologic dead space.
 * 1)  The sum of the anatomic plus the alveolar dead spaces.
 * 2)  The sum of the parallel and the serial dead spaces.