Residual volume

Definition

Residual volume is the amount of air remaining in the lungs after a maximal exhalation. It cannot be expelled and ensures that the lungs do not collapse.

5 Must Know Facts For Your Next Test

1. Residual Volume (RV) typically represents about 20-25% of total lung capacity.
2. RV is essential for maintaining alveolar inflation and effective gas exchange.
3. Poor nutrition can negatively impact RV by weakening respiratory muscles, reducing lung function.
4. Malnutrition may lead to increased RV due to reduced muscle strength affecting the ability to fully exhale.
5. Measurement of RV is important in diagnosing and managing pulmonary conditions like COPD.

Review Questions

• What percentage of total lung capacity does residual volume generally represent?
• How can malnutrition affect residual volume?
• Why is residual volume important for the lungs?

Related terms

Tidal Volume: The amount of air inhaled or exhaled during normal breathing.

Total Lung Capacity: The maximum amount of air the lungs can hold after a maximum inhalation.

Forced Vital Capacity: The total amount of air that can be forcibly exhaled after full inhalation.