Dr Tim Pearce Anatomy Poster: Human Alveoli Gas Exchange

Biological diagram infographic titled "Human Alveoli and Gas Exchange" centered on a clean labeled cross-section of terminal bronchiole leading into an alveolar sac and surrounding pulmonary capillary network, editorial-grade educational anatomy layout for high school/general audience. Render an editorial scientific medical illustration in tasteful Netter-style, monochrome scientific palette with soft graphite, slate gray, charcoal, and subtle cool gray shading, calm academic mood, crisp linework, high legibility, balanced white background. Show biologically accurate proportions and anatomy: terminal bronchiole branching into alveolar duct, cluster of alveoli in cross-section, thin alveolar walls, adjacent capillary mesh with red blood cell silhouettes simplified in monochrome, and directional arrows indicating oxygen diffusion into blood and carbon dioxide diffusion into alveolar air. Arrange exactly 7 labels around the central diagram with thin leader lines; each label must include a short English heading in quotes and a one-line English function caption in quotes. Include these exact labels and captions: 1. "Terminal bronchiole" — "Conducts air toward the gas-exchange region." 2. "Alveolar duct" — "Channels air from bronchioles into alveolar sacs." 3. "Alveolus" — "Tiny air chamber where oxygen and carbon dioxide are exchanged." 4. "Alveolar wall" — "Extremely thin barrier that allows rapid gas diffusion." 5. "Pulmonary capillary" — "Carries blood past the alveolus to pick up oxygen." 6. "Red blood cell" — "Transports oxygen from the lungs to body tissues." 7. "Respiratory membrane" — "Combined alveolar and capillary surface where gas exchange occurs." Add small unobtrusive callouts for "O2 into blood" and "CO2 into alveolus" with directional arrows near the respiratory membrane. Emphasize medical-textbook clarity, editorial scientific illustration, vector-clean lines, no photographic textures, all text sharp and readable, scientifically accurate labeling, no graphic gore, no real patient photos, no surgical blood, no watermarks. 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.