Expiratory Reserve Volume (ERV)
Defines the additional volume of air that can be expired by a forceful expiration after a normal expiration.
What is Expiratory Reserve Volume (ERV)?
The maximum volume of air that can be forcefully exhaled from the lungs after a normal tidal expiration.
Key points
- Define Expiratory Reserve Volume (ERV).
- Quantify the typical volume of ERV.
- Identify factors affecting ERV.
- Relate ERV to overall lung function and spirometry.
Common exam trap
Confusing ERV with Residual Volume (RV). ERV is exhaled air, RV is the air remaining after maximal exhalation.
Definitions
- Term
Expiratory Reserve Volume (ERV)
- Meaning
The maximum volume of air that can be forcefully exhaled from the lungs after a normal tidal expiration.
- Term
Spirometry
- Meaning
A pulmonary function test used to measure lung volumes and capacities.
Learning objectives
Define Expiratory Reserve Volume (ERV).
Quantify the typical volume of ERV.
Identify factors affecting ERV.
Relate ERV to overall lung function and spirometry.
Prerequisites
Understanding of basic respiratory anatomy (lungs, diaphragm, intercostal muscles).
Knowledge of normal breathing (tidal volume).
Common mistakes
Confusing ERV with Residual Volume (RV). ERV is exhaled air, RV is the air remaining after maximal exhalation.
Not understanding that ERV requires forceful effort, unlike tidal volume.
Keywords
Expiratory Reserve Volume
ERV
Lung Volumes
Spirometry
Respiratory Physiology
Pulmonary Function Test
Practice preview
What is Expiratory Reserve Volume (ERV)?…
easy
Which of the following best describes the Expiratory Reserve Volume (ERV)?…
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A person takes a normal breath in and then exhales normally. The additional volume of air they can forcefully expel is known as:…
easy