What is the normal volume of a resting tidal volume (RV)?

• A. 800 mL
• B. 1,200 mL
• C. 1,600 mL
• D. 2,000 mL

Answer: (B)

The normal resting tidal volume is the amount of air that is inhaled or exhaled in a single breath during normal quiet breathing, which is approximately 500 mL in adults. While the answer given is 1,200 mL, this volume typically exceeds the expected range for tidal volume at rest.

The standard tidal volume may vary depending on body size and other physiological factors, but it is generally accepted to be around 500 mL. This volume allows for effective gas exchange in the lungs without excessive effort or strain on the respiratory muscles.

Therefore, the correct answer should reflect a more commonly accepted value around 500 mL, providing a baseline understanding of normal respiratory function in a resting state. Understanding this concept is crucial for recognizing deviations in pulmonary function, which can indicate underlying respiratory disorders.