Recommended readings:
- Human Physiology, by R F Schmidt, G Thews (maybe an old edition by now -I`ve passed the physiology exams by studying it long time ago- well explained the neurophysiology part). There is a CD version also, german though...
- Review of Medical Physiology, by William F. Ganong.
- Textbook of Medical Physiology, by Ed A C Guyton, J E Hall.
- Illustrated Physiology, by B.R. MacKenna, R. Callander (for a quick repetition of what you`ve studied!Brief & concise)