Lung Expansion

Andrew Huberman explains the mechanics of lung expansion and breathing. The lungs are described as two large bags that can expand and contract to move air in and out. This expansion and contraction are facilitated by the diaphragm and intercostal muscles. The diaphragm is a crucial muscle that contracts during inhalation, moving downwards and allowing the lungs to expand. The intercostal muscles help by expanding the rib cage, further increasing lung volume. These muscles are controlled by specialized neurons in the brain and spinal cord, which activate them to facilitate breathing 1.

Moreover, each lung contains hundreds of millions of small sacs called alveoli, which increase the lung's surface area. This structure improves the efficiency of gas exchange—oxygen comes into the blood, and carbon dioxide is expelled. Respiratory health, particularly preventing the collapse of alveoli, is maintained by taking deep breaths periodically, which re-inflate any alveoli that might start to collapse 2 3.