![]() The O 2-equilibrium curve can be physiologically modulated in three ways: (a) the vertical height of the concentration curve (but not the saturation curve) can change, indicating a change in O 2cap, (b) the horizontal position of saturation and concentration curves can change, indicating a change in Hb-O 2 affinity, and (c) the shape of saturation and concentration curves can change, indicating a change in the chemical reaction between O 2 and Hb. = O 2 consumption per unit timeĪ = Ventilation of the alveoli per unit time PaO 2 = Partial pressure of O 2 in arterial bloodį CO 2 = Fraction of CO 2 in dry mixed, expired gas PAO 2 = Partial pressure of O 2 in alveolar gas Respiratory exchange ratio (dimensionless) Gas pressure or partial pressure (cm H 2O or mm Hg) TABLE 43.1 SYMBOLS IN RESPIRATORY PHYSIOLOGYĬoncentration or content (mL/dL or mmol/L)ĭiffusing capacity įractional concentration in dry gas (dimensionless)
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