Biology / Unit 13 Bio 3151 short lesson, about 20 seconds
Mammalian Lung Structure
Captions available
The idea
A mammalian lung branches from the trachea through bronchi and bronchioles into millions of alveoli, thin-walled sacs surrounded by capillaries, supplying the area per Bio 3143.
In practice
Alveolar surface area in human lungs is roughly 75 square meters, about half a tennis court.
Where people slip
Alveoli hold no muscle; airflow depends on pressure changes elsewhere in the chest.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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