Educational worksheet for learning respiratory system vocabulary terms.

Let’s go step by step to match each definition with the correct word from the word bank.

Word Bank:
- lungs
- diaphragm
- nasal passages
- trachea
- bronchi
- alveoli

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Question 1:
“these little sacs are where carbon dioxide leaves the blood and oxygen enter it”
→ This is describing alveoli. They’re tiny air sacs in the lungs where gas exchange happens.

✔ Answer: alveoli

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Question 2:
“this large muscle helps you fill and empty your lungs”
→ That’s the diaphragm. It moves up and down to help you breathe.

✔ Answer: diaphragm

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Question 3:
“you inhale air through these about 20 times a minute.”
→ You breathe in through your nose — so this means nasal passages. (Even though we can also breathe through our mouth, the question says “inhale air through these,” and nasal passages are part of the normal breathing path.)

✔ Answer: nasal passages

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Question 4:
“two large, and very important, organs inside your chest cavity.”
→ Those are the lungs. Everyone has two lungs.

✔ Answer: lungs

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Question 5:
“this the tube that carries air to the lungs.”
→ That’s the trachea, also called the windpipe.

✔ Answer: trachea

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Question 6:
“the tubes inside the lungs that lead to the alveoli.”
→ After the trachea, air goes into the bronchi (singular: bronchus), which branch out inside the lungs and lead to the alveoli.

✔ Answer: bronchi

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Now let’s do the fill-in-the-blank paragraph at the bottom:

> Respiration begins in the ________________, where air comes into the body.
→ Air enters through the nasal passages.

> Air travels through the ________________ to the ________________.
→ First through the trachea, then to the lungs.

> The ________________ pushes up and down to fill and empty the lungs.
→ That’s the diaphragm.

> Inside the lungs, air in the ________________ travels to the small sacs called ________________.
→ Air moves through the bronchi to reach the alveoli.

> Inside those small sacs is where the important gas exchange occurs.
→ Already explained — that’s the alveoli again.

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Final Answers:

1. alveoli
2. diaphragm
3. nasal passages
4. lungs
5. trachea
6. bronchi

Paragraph blanks (in order):
nasal passages → trachea → lungs → diaphragm → bronchi → alveoli

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Final Answer:
1. alveoli
2. diaphragm
3. nasal passages
4. lungs
5. trachea
6. bronchi

Respiration begins in the nasal passages, where air comes into the body.
Air travels through the trachea to the lungs.
The diaphragm pushes up and down to fill and empty the lungs.
Inside the lungs, air in the bronchi travels to the small sacs called alveoli.
Inside those small sacs is where the important gas exchange occurs.