Anatomy and Physiology II Practice Test

What is the approximate volume of air we inhale and exhale during a normal breath termed?

1. residual volume

2. tidal volume

3. essential volume

4. reserve volume

The correct answer is: tidal volume

The term that describes the approximate volume of air inhaled and exhaled during a normal breath is tidal volume. This volume is a key component of respiratory physiology, representing the amount of air that moves in and out of the lungs with each breath during normal, resting conditions. Typically, the tidal volume for an average adult is about 500 milliliters per breath. Understanding tidal volume is crucial because it helps in assessing lung function and respiratory health. For instance, in conditions such as obstructive lung diseases, tidal volume may change, affecting overall ventilation. Additionally, tidal volume plays a significant role in calculating total lung capacity and other respiratory volumes, thus providing insight into the efficiency of gas exchange in the lungs.