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World 5 · Respiratory System · 6 min · PRO

The airway

From nose to lungs

PRO · Human Body

World 5: Respiratory System is part of PRO

The first world of Human Body is free. PRO opens the other 119 lessons in 17 worlds — simulations, quizzes and all.

  • The lungs and alveoli
  • The mechanics of breathing
  • Gas exchange and transport
  • Controlling your breath
  • Lab: build the respiratory system
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

Unlock Human BodyTry the free world
← Pulse and blood pressureThe lungs and alveoli →

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