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Related Concept Videos

Lung Capacity01:47

Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Diffusion01:12

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Respiratory Capacities01:24

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Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
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Exercise Stress Test01:26

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Related Experiment Video

Updated: Jan 25, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
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Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

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Effect of exercise on pulmonary diffusing capacity

G M Turino, E H Bergofsky, R M Goldring

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |May 15, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Pulmonary diffusing capacity for oxygen (DlO2) increases with exercise intensity and exceeds that for carbon monoxide (DlCO). Lung oxygen diffusion does not limit maximal exercise in healthy adults.

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    Area of Science:

    • Physiology
    • Respiratory Medicine
    • Exercise Science

    Background:

    • Understanding gas exchange during exercise is crucial for assessing respiratory function.
    • Pulmonary diffusing capacity (Dl) quantifies the efficiency of gas transfer across the alveolar-capillary membrane.

    Purpose of the Study:

    • To investigate the effect of graded exercise on pulmonary diffusing capacity for oxygen (DlO2) and carbon monoxide (DlCO).
    • To compare the behavior of DlO2 and DlCO under varying exercise intensities.
    • To determine if body position affects Dl during exercise.

    Main Methods:

    • Healthy young adults performed graded exercise using steady-state methods.
    • Simultaneous measurements of DlO2 and DlCO were conducted.
    • Body position (supine vs. upright) was varied.

    Main Results:

    • DlO2 increased progressively with exercise severity.
    • At high exercise levels, DlO2 exceeded DlCO by more than predicted by gas diffusivity differences.
    • DlCO increased less than DlO2 with exercise, with no plateau observed.
    • Body position did not influence DlO2 or DlCO during exercise.

    Conclusions:

    • Pulmonary diffusing capacity for oxygen is not a limiting factor for maximal exercise capacity in healthy individuals.
    • The observed differences between DlO2 and DlCO at high exercise levels suggest mechanisms beyond simple gas diffusivity.