Alveoli Gas Exchange Pathway Anatomy Infographic

Biological diagram infographic titled "Alveoli Gas Exchange Pathway" centered on a clean labeled pathway diagram of the human respiratory alveoli, showing airflow input to blood output and blood carbon dioxide return, with input → output markers and directional arrows. Main composition: an editorial-grade anatomical cross-section of terminal bronchiole leading into an alveolar sac with several alveoli, surrounded by pulmonary capillaries, scientifically accurate proportions, educationally tasteful human anatomy, high school / general audience readability. Arrange 7 labels around the central diagram with thin leader lines; each label must contain a short heading in English and a one-line function description in English. Include these exact labels and captions: "Terminal Bronchiole" — "Conducts inhaled air to the respiratory zone."; "Alveolar Sac" — "Clusters multiple alveoli for efficient gas exchange."; "Alveolus" — "Thin-walled air chamber where oxygen enters blood."; "Capillary Network" — "Carries blood around alveoli for rapid diffusion."; "Respiratory Membrane" — "Ultra-thin barrier separating air from blood."; "Oxygen Diffusion" — "O2 moves from alveolar air into capillary blood."; "Carbon Dioxide Diffusion" — "CO2 moves from blood into alveolar air for exhalation." Add subtle pathway notation for "Inhaled air" entering from bronchiole side and "Oxygenated blood" exiting capillary side, with "Deoxygenated blood" as incoming blood flow, all in English. Visual style: vintage 1900s scientific plate, natural anatomy tones palette, muted sepia, warm ivory background, soft red-brown capillaries, pale pink alveolar tissue, restrained blue-gray airflow accents, elegant engraved shading, refined atlas layout, sharp readable typography, balanced negative space, medical-textbook clarity, editorial scientific illustration, vector-clean lines, no photographic textures. 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.