Which one of the following is a wrong statement?

Options

A. Pleural fluid protects the lungs from shock.
B. Lungs are covered by single membrane.
C. Air exchange takes place at alveoli.
D. Pharynx is common for both respiratory system and digestive system.

Answer

To determine which statement is wrong, let's analyze each of the statements provided in the video transcript:

1. **Plural fluid protects the lung from shock.**
- This statement is true. Pleural fluid acts as a lubricant and helps to cushion the lungs, protecting them from shock.

2. **Lungs are covered by single membrane.**
- This statement is incorrect. The lungs are actually covered by a double membrane known as the pleura. The outer layer is called the parietal pleura, and the inner layer is called the visceral pleura.

3. **Air exchange takes place at LVLI.**
- This statement is likely a typographical error and should refer to "alveoli." If so, it is true that air exchange occurs in the alveoli, which are tiny air sacs in the lungs.

4. **Pharynx is common for respiratory and digestive systems.**
- This statement is true. The pharynx serves as a passageway for both air (to the lungs) and food (to the esophagus).

Based on the analysis:

- The wrong statement is: **"Lungs are covered by single membrane."**

### Step-by-Step Solution:
1. Read each statement carefully.
2. Identify the function or characteristic being described.
3. Compare the statements against known biological facts about the respiratory system.
4. Determine which statement does not align with the facts.