Advanced respiratory system physiology

Lessons
Respiratory system introduction
Quiz
5 questions
Gas exchange
Breathing control

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About this unit
With every inhale, air rushes through your windpipe to your lungs. After 20 to 30 branch points, oxygen diffuses into the liquid around the alveoli and slips into your blood. Carbon dioxide travels from the blood to the air and leaves the body when you exhale. Learn more about the respiratory system in these videos!