Human Alveoli Cross-Section Dissection Poster Infographic

Biological diagram infographic titled "Human Alveoli Cross-Section" centered on a clean labeled anatomical cross-section of terminal bronchiole leading into alveolar ducts, alveolar sacs, and individual alveoli in the human respiratory system. Render an editorial-grade educational anatomy illustration for a curious enthusiast, scientifically accurate proportions and biologically accurate naming, tasteful medical presentation, inspired by a dissection-poster layout but fully illustrated and non-gory. Show a central enlarged cross-section with 9 labels arranged evenly around the diagram, each connected by a thin leader line to the exact structure, with sharp readable English text, short heading, and a one-line function caption. Include these 9 labeled parts exactly: "Terminal bronchiole" — "Conducts air toward the gas-exchange region."; "Respiratory bronchiole" — "Begins the transition from airflow passage to gas exchange."; "Alveolar duct" — "Channels air deeper into clusters of alveoli."; "Alveolar sac" — "A shared chamber where multiple alveoli open."; "Alveolus" — "Tiny air pocket where oxygen and carbon dioxide are exchanged."; "Capillary network" — "Surrounds alveoli and carries blood for gas exchange."; "Alveolar wall" — "Ultra-thin barrier that allows rapid diffusion of gases."; "Type I pneumocyte" — "Flat epithelial cell forming most of the gas-exchange surface."; "Type II pneumocyte" — "Secretes surfactant to reduce surface tension and help keep alveoli open.". Optional subtle inset details may show red blood cells inside capillaries and arrows for O2 moving into blood and CO2 moving into alveolar air, but keep the focus on the labeled cross-section. Visual style: minimal flat scientific, medical-textbook clarity, editorial scientific illustration, vector-clean lines, no photographic textures. Color palette: forest green and earth tones, muted sage, deep moss, warm taupe, clay beige, soft cream background, restrained dark charcoal text. Mood: calm, precise, educational, elegant. Composition should be balanced, with clean negative space, consistent line weights, and no clutter. All text MUST be written in English (array). Every heading, label, caption, legend and metric name in the image must be in English — not English. Spell each English word correctly using English characters and diacritics. Numbers stay as digits, no graphic gore, no real patient photos, no watermarks No graphic medical gore, no real patient photographs, no surgical blood. For human anatomy, keep illustrations educationally tasteful. For animal anatomy, no cruelty imagery. Scientifically accurate labeling and proportions.