Human Respiratory System Anatomy - Lungs and Airway Diagram #167380 (License: Personal Use)

This black-and-white line drawing depicts the upper respiratory tract and pulmonary anatomy, highlighting the nasal passage, pharynx, larynx, trachea, primary bronchi, and progressively smaller bronchioles ending in alveolar clusters. Arrows indicate the direction of airflow during inhalation, emphasizing the path oxygen takes to reach gas-exchange sites. The illustration uses cross-hatching to differentiate airways and lung tissue layers.

Used in educational materials, health websites, biology textbooks, and patient information leaflets to explain breathing mechanics and lung structure; matches user intent for learning basic respiratory anatomy or understanding conditions like asthma or COPD.