Partial Pressure of Gases
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Questions and Answers

What does the partial pressure of a gas refer to?

  • The total pressure exerted by all gases in a mixture
  • The pressure exerted by gases in the lungs only
  • The pressure a single gas exerts in a mixture of gases (correct)
  • The average pressure of all gases in the atmosphere

    • How does temperature affect the pressure exerted by gas molecules?

  • Higher temperature increases gas pressure (correct)
  • Higher temperature decreases gas pressure
  • Gas pressure is only affected by gas concentration
  • Temperature has no effect on gas pressure

    • What is the average atmospheric pressure at sea level?

  • 1013 mmHg
  • 760 mmHg (correct)
  • 500 mmHg
  • 700 mmHg

    • What percentage of oxygen is present in the atmosphere?

    <p>21%</p> Signup and view all the answers

    Which law explains the behavior of gas mixtures and their partial pressures?

    <p>Dalton's Law</p> Signup and view all the answers

    Which of the following describes bulk flow in gas exchange?

    <p>Moving air in and out of the lungs</p> Signup and view all the answers

    In the context of gas exchange, what effect does high partial pressure of oxygen have?

    <p>Enhances the transfer of oxygen to tissues</p> Signup and view all the answers

    Which of the following mechanisms primarily governs gas exchange between blood and tissues?

    <p>Diffusion</p> Signup and view all the answers

    What is the partial pressure of inspired oxygen (PIO2) at sea level in dry air?

    <p>150 mm Hg</p> Signup and view all the answers

    How does the partial pressure of O2 change when moving to higher elevations?

    <p>It decreases.</p> Signup and view all the answers

    What is the effect of increasing the fractional concentration of O2 in inspired air to 80% on PIO2 at sea level?

    <p>It increases PIO2 to 570.4 mm Hg.</p> Signup and view all the answers

    What does Henry's Law describe about gas concentration in a liquid?

    <p>It is proportional to solubility and the gas's partial pressure.</p> Signup and view all the answers

    Which factor is NOT considered when calculating the partial pressure of inspired oxygen (PIO2)?

    <p>Temperature of the surrounding air.</p> Signup and view all the answers

    What is the partial pressure of O2 at the top of Mt. Humphrey’s where atmospheric pressure is 520 mm Hg?

    <p>99.33 mm Hg</p> Signup and view all the answers

    Which of the following statements about dissolved gases is true?

    <p>Concentration of a gas in solution depends on its partial pressure and solubility.</p> Signup and view all the answers

    What happens to the partial pressure of O2 when air is humidified?

    <p>It decreases as water vapor pressure is added.</p> Signup and view all the answers

    Study Notes

    Partial Pressure

    • Partial pressure of a gas (Pgas) is the pressure a single gas exerts in a mixture of gases.
    • The most abundant gas in our atmosphere is nitrogen.
    • The average atmospheric pressure at sea level is ≈ 760 mmHg.
    • The partial pressure of oxygen in air is 21%.

    Calculating Partial Pressure

    • Dalton's Law: the total pressure of a mixture of gases is the sum of the individual pressures.
    • Px = Patm x Fx
      • Px = partial pressure of a gas (mm Hg)
      • F = fractional concentration of gas
    • Px = (Patm – PH2O) x Fx
      • Px = partial pressure of a gas
      • PH2O = partial pressure of water vapor in the mixture

    Partial Pressure of Oxygen

    • PO2 at sea level in dry inspired air is 160 mmHg.
    • PIO2 (partial pressure of inspired oxygen) is ≈ 150 mm Hg
    • PIO2 is lower at higher elevations because atmospheric pressure is lower.
    • PIO2 is higher when receiving supplemental oxygen because the fractional concentration of oxygen (FIO2) increases.

    Henry's Law

    • Defines the relationship between the concentration of a gas in a liquid and its partial pressure.
    • Concentration of a GAS (in liquid) = Px x solubility
    • The concentration of a gas in a solution is only due to the dissolved gas, not bound or chemically modified.
    • This means that the partial pressure of a gas in the liquid phase is equivalent to its partial pressure in the gas phase.

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    Lecture 20: Gas Exchange PDF

    Description

    Test your knowledge on the concept of partial pressure and Dalton's Law. This quiz covers key aspects of gas mixtures, including the calculation of partial pressures of individual gases. Get ready to understand how atmospheric pressure and gas fractions influence the behavior of gases.

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