What is the expiratory reserve volume in milliliters?

Expiratory reserve volume (ERV) refers to the maximum amount of air that can be exhaled after a normal tidal expiration. It represents the additional volume of air that can still be expelled from the lungs beyond the typical volume used in quiet breathing. The average value for expiratory reserve volume in healthy adults is approximately 1200 mL, making it the most suitable choice among the options provided.

In clinical contexts, knowledge of expiratory reserve volume is important for evaluating lung function and respiratory mechanics. It helps assess conditions such as obesity, restrictive lung diseases, and other pulmonary issues where lung volumes can be affected. Understanding these parameters allows healthcare professionals to tailor respiratory care and interventions effectively.