Educational worksheet on the respiratory system featuring a labeled diagram and comprehension questions.

Let’s solve this step by step.

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Part 1.1: Answer the questions using the words in the box.

The word box has:
→ oxygen
→ involuntary
→ carbon dioxide

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a) What gas does human being take in when we breathe?
We inhale ________.

When we breathe in, our body takes in oxygen — it’s the gas we need to stay alive.
✔ So, answer: oxygen

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b) What gas does human beings eliminate during respiration?
We exhale ________ ________.

When we breathe out, we get rid of carbon dioxide — it’s a waste gas from our body.
✔ So, answer: carbon dioxide

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c) Is respiration a voluntary or involuntary movement?
It is an ________ movement.

Breathing happens automatically — you don’t have to think about it. That means it’s involuntary.
✔ So, answer: involuntary

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Part 1.2: Name the organs of the respiratory system.

We have a labeled diagram with numbers 1–7 and letter a). We need to match each label to the correct organ from the list:

List of organs:
- Nose
- Bronchioles
- Larynx
- Trachea or windpipe
- Bronchi
- Pharynx
- Lungs
- Alveolar sacs or alveoli

Now let’s match based on standard respiratory anatomy:

1) Points to the top part of the nose → Nose
2) Points to the throat area behind the mouth/nose → Pharynx
3) Points to the voice box below pharynx → Larynx
4) Points to the main airway going down → Trachea or windpipe
5) Points to the large branching tubes entering lungs → Bronchi
6) Points to smaller branches inside lungs → Bronchioles
7) Points to tiny air sacs at end of bronchioles (shown in zoomed-in circle) → Alveolar sacs or alveoli
a) Points to the whole lung organ → Lungs

✔ All matched correctly.

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Final Answer:

1.1
a) oxygen
b) carbon dioxide
c) involuntary

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