Quick Fact: Mammals, whether they're roaming the Serengeti or swimming with Nemo, use lungs for gas exchange. Yes, that means whales and dolphins too!

• Air is inhaled through the trachea (think of it as the main highway for air! 🛣️).
• Then, it's divided between left and right bronchi. Imagine them as the main streets off the highway.
• Bronchi then split further into little side roads called bronchioles.

• Off the bronchioles, you'll find the alveolar ducts. Think of them as driveways that lead to houses. But instead of houses, they lead to a group of tiny air sacs called alveoli.
• Cool Fact: A single alveolus is super small, between 0.2mm to 0.5mm. That's even tinier than a grain of sand on the beach!

• The wall of an alveolus? SUPER thin, about 0.2µm! That’s like comparing the thickness of a single hair strand to the Eiffel Tower! 🗼
• These walls allow gases like oxygen and carbon dioxide to pass through easily. It's like how you can easily hear your neighbour's music if the walls between your apartments are super thin.