Part 6 · Respiratory Physiology
Same concept, other depth: Foundation →
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Normal: PA ≈ 25/8 (mean 12–16) mmHg; PAWP 6–12; CO 5 L/min → PVR = (mPAP − PAWP)/CO ≈ 1–1.5 Wood units (< ~1/10 of SVR). Rising flow recruits closed capillaries (apex) and distends open ones, so PVR falls as CO rises. PVR is lowest near FRC (U‑shaped relation to lung volume — extra‑alveolar vessels narrow at low volume; alveolar vessels compressed at high volume).
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