Part 6 · Respiratory Physiology
Same concept, other depth: Foundation →
Dear Doctor, shall we discuss & understand?
Sweet, clear and patient — like a friend who really wants you to get it. I believe in you — let's grow step by step.
Voice chat works best in Chrome or Edge — you can also read, listen and type below.
Normal airway resistance (Raw) ≈ 1–2 cmH₂O·L⁻¹·s. In laminar flow R ∝ ηL/r⁴; in turbulent flow (trachea, large bronchi, high flows) driving pressure ∝ flow² and depends on gas density — the basis of heliox in upper‑airway obstruction. Most normal Raw lies in medium‑sized bronchi (generations ~4–8); the very numerous small airways (< 2 mm) contribute < 20% — the "quiet zone", where disease can progress silently.
Loading the rest of this concept…
Talk it through with Dr. Amy
Dear Doctor, I'll teach a little, then listen to you — slowly, warmly, and at your pace.
Finished this one?
No test, no score — just a tick for you, kept on your own device.
Connected to this topic
Educational only — not a substitute for clinical judgement, supervision, or local guidelines.