alveoli
Noun
The word is derived from alveolus
Meaning
of Alveolus
Source: Webster's dictionaryExamples
At birth the lungs are very undeveloped with only a fraction of the alveoli present.
Blood passes through small capillaries next to the alveoli in the lung, receives oxygen, and travels back to the heart.
Cause Oxygen passively diffuses in the lung alveoli according to a pressure gradient.
Damaged tissue leads to a leakage of fluid and cells, which fill up the alveoli like so many water balloons, decreasing the amount of oxygen they can carry.
As these pass by alveoli carbon dioxide is exchanged for oxygen.
Malpighi, while studying the structure of the lung, noticed its membranous alveoli and the hair-like connections between veins and arteries, which he named capillaries.