Which of the Following Methods to Measure Gas in the Lungs

question 4

Multiple Choice

Which of the following methods to measure gas in the lungs is based on Boyle's law?

• A) Helium dilution
• B) End-tidal CO₂
• C) Nitrogen washout
• D) Body plethysmography

---

Definitions:

Internal Validity

The extent to which a study accurately establishes a cause-effect relationship within its controlled variables.

Observer Bias

The distortion of measurement or perception due to the personal beliefs, expectations, or experiences of the researcher or observer.

Unusual Problems

Issues or difficulties that deviate from what is typically encountered or expected in everyday life or in standard diagnostic frameworks.

Uncommon Disorder

A rare or infrequent medical or psychological condition that affects a small percentage of the population.