How does the oxygen saturation of arterial blood change almost immediately upon exposure to an oxygen-depleted vacuum environment?

Answer

The oxygen diffuses away, leading to deoxygenation.

Since the vacuum environment lacks oxygen, any oxygen previously bound to hemoglobin will quickly diffuse away from the molecule, driving the fluid toward its deoxygenated state.

How does the oxygen saturation of arterial blood change almost immediately upon exposure to an oxygen-depleted vacuum environment?

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