How Expiration Works: Anatomy and Physiology of Breathing Out #3715863 (License: Personal Use)

This diagram illustrates the physiological process of expiration: as the diaphragm relaxes and moves upward, the volume of the thoracic cavity decreases, increasing intrapulmonary pressure and forcing air out through the airways. The right-side schematic highlights the negative pressure at the glottis and positive pressure in the alveoli driving airflow outward. Arrows indicate direction of movement and airflow during passive exhalation.

Used in educational medical content (e.g., physiology textbooks, anatomy websites, respiratory therapy resources) to explain normal breathing mechanics; targets students, healthcare trainees, and patients seeking to understand respiration.