Use the following key to determine the best answer. -(1) PO₂ of arterial blood (2) PO₂ of intracellular fluid A)First item is greater than the second item. B)First item is less than the second item. C)First item is equal or nearly equal to the second item.

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The key provided seems to refer to the concentration of substances (possibly ions, proteins, or other solutes) in arterial blood versus intracellular fluid. Typically, the composition of arterial blood and intracellular fluid differs significantly due to the cellular membrane's selective permeability and active transport mechanisms. For instance, arterial blood usually has higher oxygen content, glucose, and ions like Na+ and Cl- compared to intracellular fluid, which has higher concentrations of K+ and other organic phosphates. Therefore, without specific details on the substances referred to by the code, the general principle of differing compositions leads to the conclusion that the first item (arterial blood) is greater than the second item (intracellular fluid) in some aspects.

Use the Following Key to Determine the Best Answer