State the volume of air remaining in the lungs after a normal breathing.

Explanation

To determine the volume of air remaining in the lungs after normal breathing, we need to understand the concept of Functional Residual Capacity (FRC). Here’s a step-by-step solution:

### Step 1: Define Functional Residual Capacity (FRC)
- The Functional Residual Capacity (FRC) is the volume of air that remains in the lungs after a normal expiration (breathing out).

### Step 2: Understand the Components of FRC
- FRC is the sum of two specific lung volumes:
1. **Expiratory Reserve Volume (ERV)**: This is the additional volume of air that can be forcibly exhaled after a normal expiration.
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