Question

What is the volume of air remaining in the lungs after forceful expiration called?

• A. Tidal Volume
• B. Vital Capacity
• C. Residual Volume (RV)
• D. Inspiratory Capacity

Hint:

Important lung volumes: Tidal Volume (TV) – air inhaled or exhaled during normal breathing. Vital Capacity (VC) – maximum air expelled after maximum inhalation. Residual Volume (RV) – air remaining in lungs after forceful expiration.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks for the physiological term describing the air that stays inside the lungs even after we breathe out as hard as possible.
Step 2: Detailed Explanation:
The lungs can never be completely emptied of air.
- Tidal Volume (TV) is the air exchanged during a normal breath.
- Vital Capacity (VC) is the maximum amount of air a person can exhale after a maximum inhalation.
- Residual Volume (RV) is the volume of air remaining in the lungs after the most forceful expiration.
The presence of RV is vital because it prevents the lungs (alveoli) from collapsing and allows for continuous gas exchange even between breaths.
Step 3: Final Answer:
The air remaining after forceful expiration is known as the Residual Volume (RV).