Label respiratory system worksheet - Free Printable

The task is to identify and label the different parts of the respiratory system in the provided diagram. Below is the solution with explanations for each part:

Diagram Analysis and Labeling

Here is the labeled diagram along with an explanation of each part:

#### Upper Respiratory Tract (Top Section)
1. Nasal Cavity: This is the space inside the nose where air enters the respiratory system. It warms, humidifies, and filters the air.
- Label: Nasal cavity

2. Larynx: Also known as the voice box, it contains the vocal cords and helps produce sound. It also protects the trachea from food and liquid entering it.
- Label: Larynx

3. Trachea: Commonly called the windpipe, it is a tube that connects the larynx to the bronchi. It allows air to pass into and out of the lungs.
- Label: Trachea

4. Bronchus: These are the two main branches of the trachea that lead into the lungs. They further divide into smaller bronchioles.
- Label: Bronchus

#### Lower Respiratory Tract (Middle Section)
5. Lung: The primary organs of respiration. They are responsible for gas exchange (oxygen in, carbon dioxide out).
- Label: Lung

6. Alveolus: Tiny air sacs within the lungs where gas exchange occurs between the blood and the air.
- Label: Alveolus

7. Bronchiole: Smaller branches of the bronchi that further divide within the lungs. They end in alveoli.
- Label: Bronchiole

#### Muscles and Support Structures (Bottom Section)
8. Rib: Part of the rib cage that protects the lungs and assists in breathing by moving during inhalation and exhalation.
- Label: Rib

9. Diaphragm: A dome-shaped muscle located at the base of the chest cavity. It contracts and relaxes to facilitate breathing.
- Label: Diaphragm

Final Labeled Diagram

- Top row (from left to right): Nasal cavity, Larynx, Trachea, Bronchus
- Middle row: Lung, Alveolus, Bronchiole
- Bottom row: Rib, Diaphragm

Explanation of Each Part

1. Nasal Cavity: Filters, warms, and humidifies the air before it reaches the lungs.
2. Larynx: Contains the vocal cords and protects the trachea.
3. Trachea: Transports air to and from the lungs.
4. Bronchus: Main branches of the trachea leading into the lungs.
5. Lung: Primary organ for gas exchange.
6. Alveolus: Site of gas exchange between the blood and air.
7. Bronchiole: Smaller branches of the bronchi ending in alveoli.
8. Rib: Protects the lungs and aids in breathing.
9. Diaphragm: Muscle responsible for the expansion and contraction of the chest cavity, facilitating breathing.

Final Answer

\[
\boxed{
\text{Nasal cavity, Larynx, Trachea, Bronchus, Lung, Alveolus, Bronchiole, Rib, Diaphragm}
}
\]