📖 what
What are alveoli?
Quick Answer
Alveoli are tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged with the blood.
The Full Story
Alveoli are microscopic balloon-like sacs at the ends of the bronchioles in the lungs. They provide a huge surface area for gas exchange, with oxygen moving into the blood and carbon dioxide moving out to be exhaled. Humans have hundreds of millions of alveoli, often estimated at about 300 million in both lungs combined. Their thin walls and close contact with capillaries make breathing efficient, but they are vulnerable to damage from smoking, infection, and some lung diseases.
Key Facts
1.About 300 million alveoli in both lungs combined
2.Main site of gas exchange
3.Surrounded by capillaries
YouTube Angle
Suggested video title for this topic:
"Meet the microscopic sacs that make breathing possible."
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