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Science30/09/2026

Human Respiratory System: A Visual Explainer

A single labelled flowchart tracing the complete pathway of air from the nose to the alveoli, followed by the mechanics of gas exchange and breathing.

Human Respiratory System: A Visual Explainer

📌 Revision Pointers

  • Air pathway: Nose → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli

  • Gas exchange occurs only at the alveoli — O₂ diffuses into blood, CO₂ diffuses out, and O₂ binds to haemoglobin

  • Breathing is mechanical: diaphragm and intercostal muscles contract to inhale, relax to exhale

One-glance diagram: Nose → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli, with gas exchange and breathing mechanics called out.

💭 Conclusion

A frequently tested NCERT-level diagram for Prelims — know the exact sequence and where gas exchange actually happens.