Part 6 · Respiratory Physiology

60. Respiratory Pressures, Muscles, the Breathing Cycle and Pneumothorax

~2 min read

Same concept, other depth: Foundation →

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Airflow requires Palv − Pao ≠ 0.
Lung distension depends on transpulmonary pressure Ptp = Palv − Ppl.
At FRC (no flow): Palv = 0, Ppl ≈ −5 cmH₂O, Ptp ≈ +5 — lung inward recoil balanced by chest‑wall outward recoil.

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