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anatomical dead space

   Also found in: Wikipedia 0.04 sec.
anatomical dead space
n.
The volume of the conducting airways of the nose, mouth, and trachea down to the level of the alveoli, representing that portion of inspired gas unavailable for exchange of gases with pulmonary capillary blood.

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Over time, these pathophysiologic changes contribute to increased anatomical dead space in the lungs and overall total lung capacity.
The subject can obtain the sample while located in a contaminated environment because any unabsorbed benzene from the anatomical dead space should be flushed from the bulb during the initial stage of exhalation.
During expiration, the anatomical dead space, containing 100% oxygen, is first emptied (phase 1).
 
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