Give appropriate biological / technical terms for the following:
Amount of air left in the lungs after maximum expiratory effort.

Explanation

To answer the question, we need to identify the appropriate biological or technical term for the amount of air left in the lungs after maximum expiratory effort.

### Step-by-Step Solution:

1. **Understanding Expiration**: When we breathe out, we expel air from our lungs. The process of breathing out is known as expiration.

2. **Maximum Expiratory Effort**: This refers to the maximum amount of air a person can forcefully exhale from their lungs. After this effort, there is still some air that remains in the lungs.

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