The Respiratory System
Grade: 5 - 12 | Lesson on respiratory system. It describes the respiratory surface, and explains how worms, insects, fish and mammals take in oxygen and release carbon dioxide. The lesson covers the major organs of the human respiratory system - pharynx, trachea, bronchus, bronchiole and alveoli. It also explains how oxygen and carbon dioxide are carried on the hemoglobin.
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Respiratory System  

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