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299 - ATPL - In relation to oxygen diffusion and transport, which statement is correct?

Question 299 - Human Performance and Limitations - ATPL - Airline Transport Pilot license

Oxygen diffusion from the blood into the cells depends on the partial oxygen pressure gradient.
Oxygen diffusion from the lungs into the blood does not depend on partial oxygen pressure.
The gradient of diffusion is higher at altitude than it is at sea-level.
Oxygen is mainly transported in plasma.

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