Human Alveoli Gas Exchange Dissection Poster Infographic

Biological diagram infographic titled "Human Alveoli and Gas Exchange" centered on a clean labeled cross-section of terminal bronchiole leading into alveolar ducts and clustered alveolar sacs, with a magnified inset of a single alveolus showing the alveolar-capillary membrane. Render an editorial-grade anatomical cross-section suitable for high school / general audience, scientifically accurate proportions, educationally tasteful, dissection-poster composition without gore. Add exactly 7 labeled parts arranged around the central diagram with thin leader lines; each label must include a short heading in English and a one-line function description in English. Labels to render exactly as: "Terminal Bronchiole" — "Conducts air to the respiratory zone."; "Alveolar Duct" — "Distributes inhaled air into alveolar sacs."; "Alveolar Sac" — "Cluster of air spaces that increases exchange area."; "Alveolus" — "Primary microscopic air chamber for gas exchange."; "Capillary Network" — "Brings blood close to air for diffusion."; "Respiratory Membrane" — "Thin barrier where oxygen and carbon dioxide diffuse."; "Elastic Fibers" — "Help alveoli expand and recoil during breathing." Include subtle directional arrows for airflow into bronchiole and diffusion across the respiratory membrane, with small input → output markers for "O2 to blood" and "CO2 to alveolus". Visual style: medical illustration (Netter-style), medical-textbook clarity, editorial scientific illustration, vector-clean lines, no photographic textures. Color palette: monochrome scientific, using grayscale, soft charcoal, muted slate, pale cool gray highlights, clean white background, calm clinical mood. All labels sharp and readable, balanced spacing, minimal legend if needed, no decorative 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.