Name the fluid present between the membranes covering the lungs.

Answer

To answer the question, we need to identify the fluid that is located between the membranes covering the lungs. Here’s a step-by-step solution:

1. **Identify the Membranes**: The lungs are covered by two membranes known as the parietal pleura and the visceral pleura.

2. **Understand the Space Between the Membranes**: There is a space between these two membranes, which is referred to as the pleural cavity.

3. **Identify the Fluid in the Pleural Cavity**: The fluid that is present in the pleural cavity is called pleural fluid.

4. **Function of the Pleural Fluid**: The primary function of pleural fluid is to reduce friction between the two membranes during breathing movements, allowing the lungs to expand and contract smoothly.

Thus, the fluid present between the membranes covering the lungs is called **pleural fluid**.