Zones of the lung
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. 
The zones of the lung proposed by West in 1964, divide the lung into three vertical regions, based upon the relationship between the pressure in the alveoli (PA), in the arteries (Pa), and the veins (Pv):
- #1: alveolar > arterial > venous
- #2: arterial > alveolar > venous
- #3: arterial > venous > alveolar
The ventilation/perfusion ratio is higher in zone #1 (the apex of lung when a person is standing) than it is in zone #3 (the base of lung.)
- ↑ West J, Dollery C, Naimark A. "Distribution of blood flow in isolated lung; relation to vascular and alveolar pressures". J Appl Physiol. 19: 713–24. PMID 14195584.
- Essentials of Human Physiology by Thomas M. Nosek. Section 4/4ch4/s4ch4_28.
- Description at anaesthetist.com
- Animated diagram at sites.fasthosts.com