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  2. Pulmonary gas pressures - Wikipedia

    en.wikipedia.org/wiki/Pulmonary_gas_pressures

    The alveolar oxygen partial pressure is lower than the atmospheric O 2 partial pressure for two reasons. Firstly, as the air enters the lungs, it is humidified by the upper airway and thus the partial pressure of water vapour (47 mmHg) reduces the oxygen partial pressure to about 150 mmHg.

  3. Alveolar gas equation - Wikipedia

    en.wikipedia.org/wiki/Alveolar_gas_equation

    The partial pressure of oxygen (pO 2) in the pulmonary alveoli is required to calculate both the alveolar-arterial gradient of oxygen and the amount of right-to-left cardiac shunt, which are both clinically useful quantities. However, it is not practical to take a sample of gas from the alveoli in order to directly measure the partial pressure ...

  4. Bohr equation - Wikipedia

    en.wikipedia.org/wiki/Bohr_equation

    is the partial pressure of carbon dioxide in the arterial blood, and P e CO 2 {\displaystyle P_{e\,{\ce {CO2}}}} is the partial pressure of carbon dioxide in the average expired (exhaled) air. Derivation

  5. pCO2 - Wikipedia

    en.wikipedia.org/wiki/PCO2

    Carbon dioxide molecule.. pCO 2, pCO 2, or is the partial pressure of carbon dioxide (CO 2), often used in reference to blood but also used in meteorology, climate science, oceanography, and limnology to describe the fractional pressure of CO 2 as a function of its concentration in gas or dissolved phases.

  6. Diffusing capacity - Wikipedia

    en.wikipedia.org/wiki/Diffusing_capacity

    is the partial pressure of oxygen in the pulmonary artery. P v O 2 {\displaystyle P_{v_{O_{2}}}} is the partial pressure of oxygen in the systemic veins (where it can actually be measured). Thus, the higher the diffusing capacity D L {\displaystyle D_{L}} , the more gas will be transferred into the lung per unit time for a given gradient in ...

  7. Shunt equation - Wikipedia

    en.wikipedia.org/wiki/Shunt_equation

    The Shunt equation (also known as the Berggren equation) quantifies the extent to which venous blood bypasses oxygenation in the capillaries of the lung.. “Shunt” and “dead space“ are terms used to describe conditions where either blood flow or ventilation do not interact with each other in the lung, as they should for efficient gas exchange to take place.

  8. Dead space (physiology) - Wikipedia

    en.wikipedia.org/wiki/Dead_space_(physiology)

    Arterial oxygen tension, or partial pressure: P A O 2: Alveolar oxygen tension, or partial pressure: P a CO 2: Arterial carbon dioxide tension, or partial pressure: P A CO 2: Alveolar carbon dioxide tension, or partial pressure: P v O 2: Oxygen tension of mixed venous blood: P (A-a) O 2: Alveolar-arterial oxygen tension difference. The term ...

  9. Control of ventilation - Wikipedia

    en.wikipedia.org/wiki/Control_of_ventilation

    Under most conditions, the partial pressure of carbon dioxide (PCO 2), or concentration of carbon dioxide, controls the respiratory rate. The peripheral chemoreceptors that detect changes in the levels of oxygen and carbon dioxide are located in the arterial aortic bodies and the carotid bodies. [2]