Explore the intricacies of lung volumes and capacities in this comprehensive 1.5-hour lecture on spirometry and the respiratory system. Delve into breathing mechanics, tidal volume, inspiratory and expiratory reserve volumes, residual volume, and functional residual capacity. Learn about total lung capacity, vital capacity, and inspiratory capacity. Understand the principles of spirometry and how to interpret spirograms. Discover methods for measuring residual volume, the effects of aging on lung volumes, and various pathological conditions affecting respiratory function. Gain valuable insights into the complexities of pulmonary physiology and diagnostic techniques used in respiratory medicine.