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pressure gradient
a difference in pressure between two areas, causing air to flow from the region of higher pressure to the region of lower pressure
P alveolar = low, P atm = high
air into lung, V^ P is decreased, diaphragm contracts, muscle contracts
P alveolar = high, P atm = low
air out of lung, V is decreased P is increased, diaphragm relaxes, passive
P alv = P atm
no movement