Definition of alveoli - NCI Dictionary of Cancer Terms - NCI
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Bronchioles and alveoli in the lungs - Mayo Clinic
Organs and Structures of the Respiratory System | Anatomy and Physiology II
1. Alveoli are air sacs in the lungs where gas exchange occurs with the blood. The tissue that makes up alveoli is simple squamous epithelium, which is different than the respiratory tract
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