Normal tidal volume is –
**Core Concept**
The question tests the understanding of **lung volumes** and **respiratory physiology**, specifically focusing on the **tidal volume**, which is the amount of air inhaled or exhaled during normal breathing.
**Why the Correct Answer is Right**
The correct answer is based on the average **tidal volume** of a healthy adult, which is approximately 500 milliliters (mL). This value represents the volume of air that moves in and out of the lungs with each breath under resting conditions, facilitated by the **diaphragm** and **intercostal muscles**.
**Why Each Wrong Option is Incorrect**
**Option A:** Is incorrect because it represents a much smaller volume, not consistent with normal tidal breathing.
**Option B:** Is also incorrect as it is higher than the typical tidal volume.
**Option D:** Is not the correct answer as it does not align with established physiological norms for tidal volume.
**Clinical Pearl / High-Yield Fact**
Remembering that **tidal volume** is a key component of **lung function** tests and understanding its normal range is crucial for diagnosing and managing respiratory diseases.
**Correct Answer:** C. 500 mL