Art style: 3D Pixar.
Ultra-realistic 3D medical animation, a cross-section view of an alveolus and an adjacent capillary. We see individual oxygen molecules (glowing blue spheres) diffusing through the thin membrane into a red blood cell, causing it to change from dark red to bright, vibrant red. Carbon dioxide molecules (grey spheres) travel in the opposite direction.
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FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt):
Render this image in the following art style:
Pixar-style 3D computer animation (Pixar / Disney feature-film look) — fully volumetric 3D rendering with rounded dimensional forms, soft subsurface-scattering skin, physically based materials, soft global illumination, warm cinematic key light, gentle depth of field, vibrant family-friendly colours. CRITICAL: EVERY element — characters, foliage, trees, animals, water, sky, props and the entire environment — must be rendered as polished 3D CGI with real depth and form. This is NOT flat 2D illustration, NOT a watercolour or storybook painting, NOT cel-shaded anime.
Every surface, skin, fabric, material, and environmental element must be rendered in this idiom.
