Word: acini
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...enters each lung through a bronchus, which branches from the windpipe (trachea). A bronchus subdivides successively into bronchioles, air ducts (ductuli alveolares), air pockets (atria), lobules. Lobules bulge with many air sacs (acini) which look like clusters of grapes. Walls of the lobules adjoin walls of capillaries in which the pulmonary veins and pulmonary arteries terminate. The pulmonary arteries bring dark blood loaded with carbon dioxide from the body's tissues to the lobules. The lobules treat the blood with fresh oxygen, leaving it pure and crimson...
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