🫁 LUNGS: HOW WE BREATHE
PAGE 1 OF 5 · THE AIR HIGHWAY
INHALE PATH
NOSE, MOUTH, TUBE, TREE
Each breath can enter through your nose or mouth. Inside the head, air warms, gains moisture, and gets a first clean from hairs and sticky mucus. It passes the voice box region, then dives down the trachea — a stiff, ringed tube that stays open. The trachea splits into two main bronchi, one for each lung, beginning a branching pattern like an upside-down tree.
⚡ AIR MATH
A resting teen might take roughly 20,000 breaths a day — a quiet rhythm that add up to a lifetime marathon.
FLOW!
GUARDS
🛡️ Nose hairs trap dust.
🌡️ Blood-rich lining warms incoming air.
🌡️ Blood-rich lining warms incoming air.
CLEAN SWEEP
👣 Microscopic cilia beat mucus up and out — escalator of gunk you cough or swallow.