🫁 Part 1: Respiratory System Structure

1. Match the respiratory system parts to their functions by drawing lines:

Nose/Mouth

Trachea

Bronchi

Alveoli

Where gas exchange occurs

Windpipe that carries air to lungs

Entry point for air into the body

Tubes that branch into each lung

2. Complete the pathway of air through the respiratory system:

Air enters through the _________ → travels down the _________ → splits into two _________ → moves through smaller _________ → reaches tiny air sacs called _________

3. Which gas do we breathe IN and which do we breathe OUT?

IN: Oxygen, OUT: Carbon dioxide

IN: Carbon dioxide, OUT: Oxygen

IN: Nitrogen, OUT: Oxygen

4. The diaphragm is a muscle that helps us breathe. When it contracts (moves down), what happens?

We breathe in (inhale)

We breathe out (exhale)

We hold our breath

🔬 Part 2: How Breathing Works

5. Explain in your own words what happens to your ribcage when you take a deep breath in:

6. Why do we need oxygen in our body? Choose the best answer:

To help our cells produce energy

To make our blood red

To help us grow taller

To keep our lungs inflated

7. What happens to your breathing rate when you exercise? Explain why this occurs:

8. Circle all the factors that can affect respiratory health:

Smoking

Air pollution

Regular exercise

Allergies

Eating vegetables

💭 Part 3: Critical Thinking

9. A person living at high altitude (like in the mountains) might breathe faster than someone at sea level. Using your knowledge of the respiratory system, explain why this might happen:

10. Design a simple experiment to show how lung capacity might differ between people. What would you measure and how?