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The Library's collection of e-books is growing all the time. These Physiology books are online:
Berne and Levy Physiology, 7th ed. by 
Vander's human physiology: the mechanisms of body function
Essentials of Anatomy and Physiology, 6th ed. by 
Physiology of the gastrointestinal tract Volume 1 and 2 by 
An Introduction to Cardiovascular Physiology, 5th ed. by 
Neuroscience by 
Clinical physiology: An examination primer by These books are a great starting point for your research and some are on Course Reserve.
Berne and Levy Physiology, 7th ed. by Vander's Human Physiology, 15th ed. by 
Essentials of Anatomy and Physiology, 8th ed. by 
Physiology of the Gastrointestinal Tract, 4th ed. by An Introduction to Cardiovascular Physiology, 5th ed. by Neuroscience, 5th ed. by 
Laboratory Manual for Anatomy and Physiology, 4th ed. by 
Excitation-Contraction Coupling and Cardiac Contractile Force, 2nd ed. by