a: The birds respiratory system ~
b: is like a jet engine


"In birds' lungs, the air moves continuously in one direction throughout the system of tubes and air sacs. These tubes are open at both ends so stale air can be flushed out more efficiently. There is always fresh air in the lungs, both upon inhale and exhale. The gasses exchange in the smallest of the tubes as the blood passes by. The birds respiratory system is like a jet engine."

Writer: Not Stated
Date: Jan 23 2015 10:54 AM

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