🫁 Part 1: Respiratory System Structure

a) The _____________ is the windpipe that carries air to the lungs.

b) The _____________ are the two main branches that lead into each lung.

c) Tiny air sacs where gas exchange occurs are called _____________.

d) The _____________ is the muscle that helps us breathe by moving up and down.

e) The two _____________ are the main organs of the respiratory system.

What is the main function of the respiratory system?

Which gas do we breathe in?

💨 Part 2: Breathing Mechanics

When we inhale, the diaphragm moves _____________ and the lungs _____________.

When we exhale, the diaphragm moves _____________ and the lungs _____________.

🔄 Part 3: Gas Exchange

🔬 Part 4: Model Construction Planning

Material: Clear plastic bottle → Represents: _________________

Material: Two balloons → Represents: _________________

Material: Straw → Represents: _________________

Material: Rubber sheet → Represents: _________________

📝 Part 5: Model Evaluation