Question

The normal value of Tidal Volume (TV) in a healthy adult is approximately:

• A. \(500\ \text{mL}\)
• B. \(2500-3000\ \text{mL}\)
• C. \(1100-1200\ \text{mL}\)
• D. \(4500-5000\ \text{mL}\)

Hint:

Important lung volumes to remember: Tidal Volume (TV) ≈ 500 mL, Inspiratory Reserve Volume (IRV) ≈ 2500–3000 mL, Expiratory Reserve Volume (ERV) ≈ 1100–1200 mL.

Answer 1

The Correct Option is A

Concept: Tidal Volume (TV) is the volume of air that is inhaled or exhaled during a normal, relaxed breath. It is one of the important parameters used to measure lung function.

Step 1: Definition of tidal volume. Tidal volume refers to the amount of air moved in or out of the lungs during a single normal breathing cycle.

Step 2: Normal value in humans. In a healthy adult at rest, the average tidal volume is approximately: \[ TV \approx 500\ \text{mL} \]

Step 3: Comparison with other lung volumes. For reference:
• Inspiratory Reserve Volume (IRV) \(\approx 2500-3000\ \text{mL}\)
• Expiratory Reserve Volume (ERV) \(\approx 1100-1200\ \text{mL}\)
• Vital Capacity (VC) \(\approx 4500-5000\ \text{mL}\)