How Oxygen Enters the Lungs - Respiratory System Diagram #236265 (License: Personal Use)

The image illustrates the human respiratory system in stylized form, with a purple torso silhouette, a cyan trachea branching into bronchi, and pink lungs filled with branching bronchioles and alveoli. Green O₂ labels indicate oxygen molecules diffusing into the alveolar sacs. The bright lime-green background enhances contrast and focuses attention on the anatomical structures.

Used in educational health content, biology textbooks, or medical websites explaining gas exchange, pulmonary function, or breathing mechanics; matches user intent for visual learning about respiration.