Interactive worksheet on the respiratory system, featuring a labeled diagram and fill-in-the-blank questions about breathing and organs.

Problem Analysis:

The worksheet focuses on the respiratory system and its functions. It includes two main sections:
1. Understanding respiration: Questions about the gases involved in breathing and the nature of respiration.
2. Identifying organs of the respiratory system: Labeling parts of a diagram of the respiratory system.

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Solution:

#### Section 1.1: Answer the questions using the words provided in the box.

The words provided are: oxygen, involuntary, carbon dioxide.

##### a) What gas does human beings take in when we breathe?
- When we breathe, we inhale oxygen.
- Answer: oxygen

##### b) What gas does human beings eliminate during respiration?
- During respiration, we exhale carbon dioxide.
- Answer: carbon dioxide

##### c) Is respiration a voluntary or involuntary movement?
- Respiration is an involuntary process, meaning it occurs automatically without conscious effort.
- Answer: involuntary

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#### Section 1.2: Name the organs of the respiratory system.

The diagram shows various parts of the respiratory system, and we need to label them correctly using the provided terms:
- Nose
- Bronchioles
- Larynx
- Trachea or windpipe
- Bronchi
- Pharynx
- Lungs
- Alveolar sacs or alveoli

##### Step-by-Step Labeling:

1. Nose: The organ at the top of the diagram where air enters the respiratory system.
- Label 1: Nose

2. Pharynx: The area just below the nose and behind the mouth, which connects the nasal cavity to the larynx.
- Label 2: Pharynx

3. Larynx: Also known as the voice box, located below the pharynx.
- Label 3: Larynx

4. Trachea or windpipe: The tube that carries air from the larynx to the bronchi.
- Label 4: Trachea or windpipe

5. Bronchi: The two main branches of the trachea that lead into each lung.
- Label 5: Bronchi

6. Lungs: The large organs where gas exchange occurs.
- Label 6: Lungs

7. Alveolar sacs or alveoli: Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.
- Label 7: Alveolar sacs or alveoli

8. Bronchioles: Smaller tubes branching off from the bronchi, leading to the alveoli.
- Label a: Bronchioles

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Final Answers:

#### Section 1.1:
a) We inhale oxygen.
b) We exhale carbon dioxide.
c) It is an involuntary movement.

#### Section 1.2:
1. Nose
2. Pharynx
3. Larynx
4. Trachea or windpipe
5. Bronchi
6. Lungs
7. Alveolar sacs or alveoli
a) Bronchioles

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Final Boxed Answers:

\[
\boxed{
\text{1.1: a) oxygen, b) carbon dioxide, c) involuntary}
}
\]
\[
\boxed{
\text{1.2: 1) Nose, 2) Pharynx, 3) Larynx, 4) Trachea or windpipe, 5) Bronchi, 6) Lungs, 7) Alveolar sacs or alveoli, a) Bronchioles}
}
\]