An alveolus (plural: alveoli) is a microscopic air sac, a delicate bubble nestled deep within the Lung. Here, across its incredibly thin walls, life's essential Gas Exchange occurs, allowing oxygen to enter the bloodstream.
An alveolus (plural: alveoli) is a microscopic air sac, a delicate bubble nestled deep within the Lung. Here, across its incredibly thin walls, life's essential Gas Exchange occurs, allowing oxygen to enter the bloodstream.