Oxygen Moves from Blood into the Interstitial Fluid and Then

Multiple Choice

Oxygen moves from blood into the interstitial fluid and then to body cells because it

A) diffuses from a region of higher partial pressure to a region of lower partial pressure.
B) diffuses from a region of lower partial pressure to a region of higher partial pressure.
C) descends down an osmotic gradient, following the movement of water.
D) diffuses from a higher to a lower pH.