Give the name and function of a fluid filled double membranous layer which surrounds the lungs.

Explanation

**Step-by-Step Solution:**

1. **Identify the Structure Surrounding the Lungs:**
- The fluid-filled double membranous layer surrounding the lungs is known as the **pleura**.

2. **Describe the Composition of the Pleura:**
- The pleura consists of two layers: the **visceral pleura** (which is attached to the lungs) and the **parietal pleura** (which is attached to the chest wall).

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