Human Respiratory System Diagram - Anatomy and Function Explained #3301119 (License: Personal Use)

The diagram illustrates the upper and lower respiratory pathways: air enters through the nasal cavity (A), travels down the trachea (C), and reaches the lungs (B) where gas exchange occurs. Structures are drawn in outline form for clarity, emphasizing airflow direction and organ relationships without extraneous detail.

Used in biology textbooks, medical education websites, and health literacy resources to teach basic respiratory anatomy; ideal for K-12 science, nursing prerequisites, or patient education materials.