Lungs & Airways Explained (3D) 🫁 - - Take a fast 3D tour through the respiratory system, from the upper airway down to the deepest air sacs in the lungs. You’ll see how air travels through the nose and throat, passes the larynx and trachea, branches into the bronchi and bronchioles, and finally reaches the alveoli where oxygen enters the blood and carbon dioxide leaves the body. Quick Facts (you’ll love these) 🫁 Your lungs contain roughly 300 million alveoli, creating a huge exchange surface a