BSCC Physiology 011
Respiratory Dead Space
The anatomical dead space can increase with a large inspiration due to the traction or pull exerted on the bronchi by lung parenchyma.The physiological dead space is those zones in the lung in which there is no elimination of CO2 in other words there is ventilation of the alveoli but no perfusion.
This physiological dead space occurs in diseased lung states only. In health individuals there is perfusion and ventilation in the alveoli and therefore the physiological dead space is often zero.