Human Alveoli Cross-Section Anatomy Infographic Diagram

Biological diagram infographic titled "Human Alveoli Cross-Section" centered on a clean labeled cross-section of the distal respiratory unit, showing a bronchiole leading into an alveolar duct, alveolar sac, and multiple alveoli with surrounding capillary network, educationally tasteful and biologically accurate for a high school/general audience. Render an editorial-grade anatomical cross-section in minimal flat scientific style, forest green and earth palette, balanced composition, high contrast text, uncluttered white or light neutral background, medical-textbook clarity, editorial scientific illustration, vector-clean lines, no photographic textures. Arrange exactly 9 labels around the central diagram with thin leader lines; each label must include a short heading in quotes and a one-line function description in quotes. Use sharp, readable typography. Labels: 1. "Terminal Bronchiole" — "Conducts air to the gas-exchange region." 2. "Alveolar Duct" — "Channels air from bronchioles into clusters of alveoli." 3. "Alveolar Sac" — "Shared chamber where several alveoli open together." 4. "Alveolus" — "Tiny air pouch where oxygen and carbon dioxide are exchanged." 5. "Capillary Network" — "Dense blood vessels that carry blood around each alveolus." 6. "Respiratory Membrane" — "Ultra-thin barrier that allows rapid diffusion of gases." 7. "Type I Alveolar Cell" — "Flat cell forming most of the alveolar surface for gas exchange." 8. "Type II Alveolar Cell" — "Secretes surfactant to reduce surface tension and prevent collapse." 9. "Alveolar Macrophage" — "Immune cell that removes dust and microbes from the air space." Include subtle airflow indication into the alveolus and gas exchange cues across the alveolar wall with small input/output markers such as O2 into blood and CO2 into alveolar air, while keeping the focus on anatomy rather than a process flow. Maintain scientifically accurate proportions, no graphic gore, no real patient photos, no surgical blood, no cruelty imagery, and all text sharp and readable. 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.