The narrowest and most numerious tubes of lungs are termed as

Options

A. hillum
B. alveoli
C. tracheae
D. bronchiloes

Answer

To solve the question "The narrowest and most numerous tubes of lungs are termed as," we need to analyze the options provided and identify the correct answer based on our knowledge of lung anatomy.

### Step-by-Step Solution:

1. **Understand the Structure of the Lungs**:
- The lungs are vital organs responsible for gas exchange. They consist of various structures that facilitate the movement of air.

2. **Identify the Options**:
- The options given are:
- A) Hilum
- B) Alveoli
- C) Trachea
- D) Bronchioles

3. **Evaluate Each Option**:
- **Hilum**: This term refers to the area where blood vessels and bronchi enter the lung. It is not a tube and is not the answer.
- **Alveoli**: These are tiny air sacs where gas exchange occurs, but they are not tubes. Therefore, this option is incorrect.
- **Trachea**: This is the windpipe that carries air to the lungs, but it is not the narrowest or most numerous structure in the lungs.
- **Bronchioles**: These are the smallest air passages in the lungs, branching from the bronchi and leading to the alveoli. They are indeed narrow and very numerous.

4. **Select the Correct Answer**:
- Based on the evaluation, the correct answer is **D) Bronchioles**. They are the narrowest and most numerous tubes in the lungs.

### Final Answer:
The narrowest and most numerous tubes of lungs are termed as **bronchioles**.

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