The P(O₂) in the tissue cells is mm Hg. The blood as it enters the surrounding systemic capillaries has a P(O₂) of mm Hg. Therefore, oxygen diffuses the systemic capillaries its partial pressure gradient into the cells.

40 mm Hg,  95 mm Hg, out of, down

Explanation:

In tissue cells the P(O2) is 40 mm Hg. The blood as it reaches the systemic capillaries around it has a P(O2) of 95 mm Hg. Hence, oxygen diffuses into the cells from the systemic capillaries down the partial pressure gradient. The carbon dioxide diffuses in the same direction at the same time.

Hence, the blanks will be filled with 40 mm Hg,  95 mm Hg, out of, down.

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