The bronchi branch into smaller airways (bronchioles), which can be as small as half a millimeter (or 2/100 of an inch) across. The bronchial tree gets its name from the shape of the airways.

Each bronchiole has thousands of tiny air sacs (alveoli). The lungs’ millions of alveoli cover over 100 square meters (1111 square feet). The alveolar walls contain a dense network of capillaries. The thin barrier between air and capillaries allows oxygen from the alveoli into the blood and carbon dioxide from the blood into the alveoli.

The 𝙩𝙧𝙖𝙘𝙝𝙚𝙖 is the main airway. The trachea divides into the left and right bronchi, which lead to the lungs. The right lung has three lobes and the left has two. The left lung is smaller than the right because it shares space with the heart.

The bronchi branch into smaller airways (bronchioles), which can be as small as half a millimeter (or 2/100 of an inch) across. The bronchial tree gets its name from the shape of the airways.

Each bronchiole has thousands of tiny air sacs (𝙖𝙡𝙫𝙚𝙤𝙡𝙞). The lungs’ millions of alveoli cover over 100 square meters (1111 square feet). The alveolar walls contain a dense network of capillaries. The thin barrier between air and capillaries allows oxygen from the alveoli into the blood and carbon dioxide from the blood into the alveoli.