Experiment

Question: How does air flow through a bird's respiratory system?

METHOD Place oxygen sensors at different locations in a bird's respiratory system. Give the bird one breath of pure O2, followed by a breath of normal air. Record when oxygen reaches different sensors.

RESULTS Breath 1

I The breath marked by pure O2 is inhaled directly to the posterior air sacs.

METHOD Place oxygen sensors at different locations in a bird's respiratory system. Give the bird one breath of pure O2, followed by a breath of normal air. Record when oxygen reaches different sensors.

RESULTS Breath 1

I The breath marked by pure O2 is inhaled directly to the posterior air sacs.

Trachea

During exhalation, the marked breath flows into the lungs.

Trachea

During exhalation, the marked breath flows into the lungs.

Exhalation

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Essentials of Human Physiology

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