Question

the ranking from highest to lowest po2 in the area of the arterial ends of the tissue capillaries is...
multiple choice
tissue fluid, capillaries, cells
capillaries, tissue fluid, cells
cells, capillaries, tissue fluid
cells, tissue fluid, capillaries

Explanation:

Oxygen diffuses from an area of higher partial pressure to an area of lower partial pressure. At the arterial ends of tissue capillaries, blood in capillaries has a higher \(PO_2\) than the tissue fluid. Tissue fluid has a higher \(PO_2\) than the cells (as cells consume oxygen in cellular respiration).

Answer:

Capillaries, tissue fluid, cells