Please help :) How does oxygen pass from the blood into the mitochondria?

Please explain :)

Once inside muscle cells, the oxygen can either bind to myoglobin (a protein like hemoglobin that enables muscle cells to store a small amount of oxygen) or enter the mitochondria to be used in the elec- tron transport chain to accept the H+ ions produced by the oxidation of carbohydrate and fat.

Soz if its not very clear, but if u get it correct, can u give me ?

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