What is the normal tidal volume (TV) for an adult?

• A. 300 mL
• B. 500 mL
• C. 750 mL
• D. 1 L

Answer: (B)

The normal tidal volume for an adult is around 500 mL. Tidal volume refers to the amount of air that is inhaled or exhaled during a normal breath at rest. This volume can vary between individuals based on factors such as body size, age, and physical fitness, but 500 mL is the established average. It is significant for assessing respiratory function and understanding lung mechanics in both normal and pathological states.

The other volumes listed are outside the typical range for adult tidal volume. A volume of 300 mL may be relevant for smaller individuals or children but is lower than the average for healthy adults. Similarly, 750 mL and 1 L are quite high for tidal volume in adults; such volumes can lead to hyperinflation and are not representative of normal resting breath patterns. Establishing the appropriate tidal volume is crucial for ventilation strategies in clinical settings, reinforcing the importance of recognizing the average value.