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The partial pressure of CO2 in the pulmonary circulation is determined to be 46 mm Hg. In order to expire CO2, the partial pressure of CO2 in the alveoli of the lungs, the site of gas exchange, should meet which of the following criterion?
A) Be = 46 mm Hg
B) Be > 46 mm Hg
C) Be < 46 mm Hg

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Option C - Be < 46 mm Hg , Partial pressure of carbon dioxide in alveoli, or PaCO2 (in normal physiological conditions around 40 to 45 mmHg). Respiratory quotient, abbreviated RQ.

What is the partial pressure of carbon dioxide in alveoli ?

  • Partial pressure of carbon dioxide in alveoli, or PaCO2 (in normal physiological conditions around 40 to 45 mmHg).
  • Respiratory quotient, abbreviated RQ. Depending on the kind of food and metabolic condition, the RQ's value can change.
  • The formula PAO2=(PBPH2O)FiO2(PaCO2R)where PB is the barometric pressure, PH2O is the water vapour pressure (typically 47mmHg), FiO2 is the fractional concentration of inspired oxygen, and R is the gas exchange ratio is used to approximation the partial pressure of oxygen in the alveolus (PAO2).
  • At alveoli, the location of diffusion, oxygen partial pressures (pO2) are 104 and carbon dioxide partial pressures (pCO2) are 40 (both in mm Hg).

Learn more about partial pressure of carbon dioxide refer to :

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