human physiology is going to be about the major body systems such as cardiovascular, nervous, endocrine, reproductive, all that kind of stuff and what factors influence them.
Cell physio is going to be abouty processes within the cell such as learning all the little stuff about membranes, the nucleus, ER, Golgi, signalling etc.
From the little i've seen, pharmacy schools want you to definitely have Human Physiology, whereas only few others want Cell Bio as a prereq. So I would do Human first if I were you.