What are alveoli?
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It is called the alveoli. Gray's Anatomy (1918) describes it as tiny air sacs at the end of the smallest airways.
Summary
It is called the alveoli. Gray's Anatomy (1918) describes it as tiny air sacs at the end of the smallest airways.
What it is
- Tiny air sacs at the end of the smallest airways.
- About 300 million in each pair of lungs.
- The site where oxygen enters the blood and carbon dioxide leaves it.
Where it is
- Grouped in clusters at the ends of the bronchioles.
- Each surrounded by a network of pulmonary capillaries.
- Their walls are only one cell thick.
Sources
According to Gray's Anatomy of the Human Body (1918, public domain):
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