What is the effect on the volume of pulmonary cavity when volume of thoracic cavity increases ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Thoracic and Pulmonary Cavities**:
- The thoracic cavity, also known as the chest cavity, is an airtight chamber that houses various organs, including the lungs.
- The pulmonary cavity is a part of the thoracic cavity specifically containing the lungs.

2. **Structure of the Thoracic Cavity**:
- The thoracic cavity is bounded by the vertebral column at the back (dorsal side), the sternum at the front (ventral side), and the ribs on the sides (lateral sides).
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