![]() ![]() PeCO2 is the partial pressure of CO2 in expired gas PaCO2 is arterial partial pressure of CO2 Physiological dead space can be calculated using Bohr's equation: Alveolar dead space is the volume of alveoli that are ventilated but not perfused (or underperfused), and anatomical dead space is the volume of the respiratory system from the nose and mouth to the level of the distal airways at which gas exchange begins to take place. It includes both alveolar and anatomical dead space. LP101939-9 Physiological dead space The physiological dead space is the volume of gas in the respiratory system that is not involved in respiratory gas exchange. Increased physiological dead space and air volume indicate abnormalities of the alveoli.76001-7 Physiological dead space Respiratory system Active Part Description.In addition, particles larger than 2.0 μm in the inhaled air are trapped in this area before entering the alveoli.The respiratory air is saturated by water vapor in the anatomical dead space and enters the alveoli. ![]() Figure: Bohr’s Equation Significance of the Dead Space The physiologically dead space can be determined by Bohr’s equation. Normal Value: In the case of a normal person, the volume of air in the anatomical dead space is almost equal to the volume of air in the physiological dead space.( Unused ventilated air = Unused air in the air sacs of the lungs + Excess received air ) Physiological dead space = Anatomical dead space + Unused ventilated air Figure: Physiological and anatomical dead space ![]() The air that is trapped at any point in the respiratory tract that does not participate in the gaseous exchange is called physiological dead space.
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