Would I be better off taking Anatomy and Physiology 1 with American History or US Government?

It's tough to say, without knowing your likes and interests. If you find history boring, then take US Government. It's a good thing to know, especially now. However, if you've done well in History before and want a less "dry" subject, go with American history. Anatomy and Physiology both involve lots of memorization, so if you take History, you might have too much of that. Government is more analytical and involves more opinion than memorizing...or at least it SHOULD be taught that way.