f3 bio

You could say Diffusion after Pressure. However, If the question just allow you answer one process. I think you'd better to say the pressure of blood flow.

Pressure exist in aorta, artery and arteriole cause the blood flowing because of the heart
beat. Therefore, the blood flow from arteriole to capillary. Blood pressure (inside capillary)
is much higher than tissue fluid in tissue space (outside). As a result, the plasma contain
soluble glucose is squeezed out through the thin wall of capillaries under pressure into the
tissue space. The pressure is win and the water potential is lose at the arteriole end of
a capillary network.

And then the tissue cell will absorb glucose through the diffusion. Active transport almost
not take place in here.

active transport