Terminals bronchioles branch to form

Options

A. alveoli
B. bronchioles
C. alveolar duct
D. respiratory bronchiole

Answer

To solve the question "Terminals bronchioles branch to form", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Respiratory System**:
- The respiratory system consists of several components including the trachea, bronchi, bronchioles, and alveoli. The bronchi branch into smaller bronchioles.

2. **Identify the Types of Bronchioles**:
- The bronchioles are classified into primary, secondary, tertiary, and terminal bronchioles. The terminal bronchioles are the last part of the conducting zone of the respiratory system.

3. **Know What Follows Terminal Bronchioles**:
- After the terminal bronchioles, the next structures that are formed are the respiratory bronchioles. These are involved in gas exchange.

4. **Recognize the Options Given**:
- The options provided are:
- Alveoli
- Bronchioles
- Alveolar duct
- Respiratory bronchioles

5. **Eliminate Incorrect Options**:
- Alveoli: These are the tiny air sacs where gas exchange occurs, but they are not formed directly from terminal bronchioles.
- Bronchioles: This term refers to the general category of bronchioles, which includes terminal bronchioles, so it is not specific to what follows.
- Alveolar duct: This is a structure that leads from the respiratory bronchioles to the alveoli, but it does not directly branch from terminal bronchioles.

6. **Select the Correct Answer**:
- The correct answer is **Respiratory bronchioles**, as they are the structures that branch from the terminal bronchioles.

### Final Answer:
Terminals bronchioles branch to form **respiratory bronchioles**.

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