Professor Diamond begins this lecture with the structure and composition of the nose, paying particular attention to the roof, septum and the lateral wall. Then she analyses the tear ducts and how these ducts relate to nasal ducts before turning to a closer look at the pharynx and larynx, and their locations and composition. She also explains how vocal cords function and how that changes in males during puberty, and she describes the motion and function of the esophagus and air pathways during eating. The she turns to the trachea and its composition and function, and she briefly explains what to do when someone is choking and discusses a procedure called the tracheotomy. Continuing down the air pathway, Professor Diamond concludes the lecture by covering the bronchia, bronchioles, terminal bronchiole, and the respiratory bronchiole, and notes what happens in these pathways for people with asthma.