**Core Concept**
The inspiratory reserve volume (IRV) is a component of the lung volumes that represents the maximum volume of air that can be inhaled in addition to the tidal volume, after a normal inspiration. It is an important measure of respiratory function and is affected by factors such as lung volume, chest wall compliance, and neuromuscular control.

**Why the Correct Answer is Right**
The inspiratory reserve volume is measured by having a person sit or stand and breathe normally, followed by a maximal inhalation. During this process, the diaphragm and other inspiratory muscles contract to increase the volume of the chest cavity, allowing air to flow into the lungs. The IRV is the volume of air that is inhaled during this maximal inhalation, and it is typically around 2,400-3,200 mL in a healthy adult.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the inspiratory reserve volume. While tidal volume is the normal volume of air inhaled and exhaled during quiet breathing, it does not account for the additional volume that can be inhaled with maximal effort.

**Option B:** This option is incorrect because it refers to the expiratory reserve volume (ERV), which is the maximum volume of air that can be exhaled after a normal expiration. The ERV is a different component of the lung volumes and is not related to inspiratory reserve volume.

**Option C:** This option is incorrect because it refers to the vital capacity (VC), which is the maximum volume of air that can be exhaled after a maximal inhalation. While the VC includes the IRV, it also includes the tidal volume and the expiratory reserve volume, making it a larger volume than the IRV alone.

**Clinical Pearl / High-Yield Fact**
The inspiratory reserve volume is an important measure of respiratory function that can be affected by a variety of factors, including lung disease, neuromuscular disorders, and chest wall deformities. A reduced IRV may indicate a restrictive lung disease or a neuromuscular disorder that affects the ability to inhale maximally.

**Correct Answer: C. 3,200 mL**