Yes, believe it or not, you can learn normal anatomy and physiology through case-based learning. Actually, I really love how Drexel does PBL - in first year you have 9 hours in small group and 15-20 hours of lecture (resource session) - lab per week. You have everything you need to learn basic sciences in the resource sessions, and you basically get to review everything again in small group, learning and presenting basic science learning issues that you've prepared to your group. It guarantees you get at least two passes through the material, basically, which is awesome for me since I'm a self-declared severe procrastinator (I've had to mend my ways a bit second year, especially because we drop to group twice a week.) Honestly, you just have to trust it and your facilitators - it will get you to where you want to go, even if the anatomy cases can feel a bit forced. Plus it's great to have exposure to clinical reasoning from the get-go, it makes you think about the patients from the very beginning. This is not to say that the anatomy cases don't sometimes feel a bit forced, you just need to make sure your LIs cover what you're doing in resource sessions. They changed a lot this year based on our input and there's a lot more integration of anatomy, histo, physio, and neuro, so hopefully it won't seem disconnected anymore. PBL does work great, particularly for physio, biochem, and immuno.
Let me know if there are any other questions you have! I know it's hard to really get a feel for how PBL works, especially because it's so different at different schools. Drexel gives you quite a few chances to test it out, by doing groups during accepted students days or shadowing a PIL group after you're accepted.