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anatomical dead space
The portions of the respiratory tract within the trachea, bronchi, and air passages containing air that does not reach the alveoli (tiny, thin-walled, capillary-rich sacs in the lungs where the exchange of oxygen and carbon dioxide takes place) during breathing.

The amount of dead space is increased by certain lung disorders; such as, emphysema.

This entry is located in the following unit: Anatomy and Related Anatomical Terms (page 2)