I guess the first thing that needs to be said about making an A in Physiology is that it can be done, and it is not accidental. After you figure that it can be done, you just have to figure how it can be done. Then, read over it again later after it's covered in class. Even after you've gotten one test under your belt, and you know how deep Dr. Davis wants your answer to be, keep on answering them in your notes even more deeply. There is a lot of stuff you just have to memorize, too.
Flash cards work well.
Therefore, it is to your advantage to seek out a friend in the class and study with them. After you've gone over your flash cards, for instance, shuffle them and hand them to your partner to quiz you on. On the other hand, don't try to memorize every detail. You don't have time, and Dr. Davis has too much to cover on a test to quiz you on minutiae. That way, a feedback loop that looks very complex and foreign on the page actually makes sense, and you can reproduce it a whole lot better than if you tried to blindly memorize it.