The partial pressure of a gas in blood depends on the amount that is physically dissolved and not on the total content of the gas present in the blood.

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The partial pressure of a gas in blood is determined by the amount of gas molecules that are physically dissolved in the blood, not by the total content of the gas present in the blood. This is known as Henry's Law. The amount of gas dissolved is proportional to the gas's partial pressure in the gas phase.

The Partial Pressure of a Gas in Blood Depends on the Amount