Follow one quiet breath.

Follow one quiet breath. A short original integrated physiology lesson: contraction of the diaphragm increases thoracic volume, alveolar pressure transiently falls below atmospheric pressure, and air enters. Oxygen then diffuses along its own partial-pressure gradient. The retrieval question asks which step is diffusion. Silent caption-led lesson with original diagrams; no narration or music. Sources: OpenStax A&P 2e §22.3: https://openstax.org/books/anatomy-and-physiology-2e/pages/22-3-the-process-of-breathing OpenStax Biology 2e §39.2: https://openstax.org/books/biology-2e/pages/39-2-gas-exchange-across-respiratory-surfaces Original AI-assisted educational content; AI source review: 16 October 2026. No clinician certification is claimed. Explain air flow and oxygen diffusion as two separate steps. https://meyshan.com/app/recall?utm_source=meyshantube&utm_medium=video&utm_campaign=student_daily_202610&utm_content=d24_c #MedicalStudents #MedicalEducation #ActiveRecall Transcript: on-screen text from this silent video; no spoken narration.