Human Alveoli Cross-Section Medical Infographic Diagram

Biological diagram infographic titled "Human Alveoli Cross-Section" centered on a clean labeled diagram, an editorial-grade cross-section of terminal respiratory anatomy showing a cluster of human alveoli connected to a respiratory bronchiole and alveolar duct, with surrounding pulmonary capillaries and interalveolar septa, scientifically accurate proportions and anatomy for a medical professional audience. Arrange 9 labels evenly around the central cross-section with thin leader lines, sharp readable typography, and concise English text. Each label must include a short heading and a one-line function description. Labels to render exactly as: "Respiratory Bronchiole" — "Conducts air to the gas-exchange region."; "Alveolar Duct" — "Channels air into multiple alveolar sacs."; "Alveolar Sac" — "Cluster of alveoli that increases exchange area."; "Alveolus" — "Primary microscopic air space for gas exchange."; "Interalveolar Septum" — "Thin wall that supports adjacent alveoli."; "Pulmonary Capillary" — "Carries blood for oxygen and carbon dioxide exchange."; "Type I Pneumocyte" — "Simple squamous cell forming most of the diffusion surface."; "Type II Pneumocyte" — "Secretes surfactant to reduce surface tension."; "Alveolar Macrophage" — "Removes inhaled particles and cellular debris." Visual style: minimal flat scientific, medical-textbook clarity, editorial scientific illustration, vector-clean lines, no photographic textures. Color palette: forest green and earth tones, soft beige background, muted green tissue layers, darker green outlines, warm brown vessel accents, calm professional mood. Use tasteful educational human anatomy with no graphic gore, no surgical blood, no real patient photographs. Emphasize clean cross-sectional cutaway structure, subtle legend-free layout, balanced negative space, and crisp labeling for professional study. 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.