COSTANZO (she wrote BRS physio as well) physiology. Hands down no contest. Coming out with a new edition within the month too if you like the most recent stuff although its probably the same as the 3rd edition (i actually have the 2nd). Sometimes the core notes for our physio course suck, so i just read costanzo. I get a solid enough base to pass the test w/o stressing over every little detial they cover in class, and i feel like im learning the stuff that will be tested on the shelf/step I