Explore the concept of Alveolar-Arterial Gradient (A-a Gradient) in this informative 17-minute video on respiratory physiology and pathology. Learn how the A-a gradient, which measures the difference between alveolar and arterial oxygen partial pressures, can be used to differentiate between intrinsic and extrinsic restrictive lung diseases. Gain insights into pulmonary medicine and enhance your understanding of respiratory function through this comprehensive explanation of the A-a gradient's significance in clinical practice.