One red cell: trace the two circuits

Follow one red cell through normal adult circulation: right atrium, tricuspid valve, right ventricle, pulmonary valve and pulmonary arteries, lung capillaries, pulmonary veins, left atrium, mitral valve, left ventricle, aortic valve, aorta, upper-body tissue capillaries and systemic veins. This selected upper-body route returns through the superior vena cava. Pause before the pulmonary return and name the receiving chamber. Original educational schematic: small branches are condensed; this is not anatomical scale or real-time transit. Oxygen-poor means relatively less oxygen, not oxygen-free. The red cell stays red and inside the vessel; gas arrows show oxygen and carbon dioxide exchange. Sources: NIH/NHLBI: https://www.nhlbi.nih.gov/health/heart/blood-flow OpenStax Anatomy and Physiology 2e: https://openstax.org/books/anatomy-and-physiology-2e/pages/20-5-circulatory-pathways https://openstax.org/books/anatomy-and-physiology-2e/pages/22-4-gas-exchange Original AI-assisted animation and synthetic English narration. AI source review: 16 October 2026. No clinician review or certification claimed. Make your own review prompt: https://meyshan.com/app/recall?utm_source=tube&utm_medium=video&utm_campaign=student_daily_202610&utm_content=d02_c_video #MedicalStudents #Physiology #Circulation