An alveolus (plural: alveoli, from Latin alveus, "little cavity"), is an anatomical structure that has the form of a hollow cavity. Mainly found in the lung, the pulmonary alveoli are spherical outcroppings of the respiratory bronchioles and are the primary sites of gas exchange with the blood.
<ul><li>Original:<a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">LadyofHats</a></li>
<li>Derivative: <a href="//commons.wikimedia.org/wiki/User:%D8%B9%D9%84%D8%A7%D8%A1" title="User:علاء">علاء</a></li></ul>
2016-08-18
Derivative from <a href="//commons.wikimedia.org/wiki/File:Alveolus_diagram.svg" title="File:Alveolus diagram.svg">this file</a>