Toward the End of a Nitrogen Washout Test for Functional

question 27

Multiple Choice

Toward the end of a nitrogen washout test for functional residual capacity, the expired concentration of N₂ begins rising. What does this probably indicate?

• A) The patient is trying too hard.
• B) There is a leak in the system.
• C) The test is nearing completion.
• D) N₂ is being trapped in the lungs.

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Definitions:

Major Components

Fundamental parts or essential elements that make up a system or structure.

Waterlogged

A condition where the soil is so saturated with water that there is insufficient oxygen for plant roots to breathe, often leading to plant stress or death.

Permeability

A measure of the ability of a material (such as soil or rock) to transmit fluids, typically referring to the ease with which water, oil, or gas can pass through.

Porosity

The measure of empty spaces in a material, allowing it to hold water or air, critical in evaluating soil health, water filtration, and material properties.