Anatomy - yes, you only have lab once a week, but you're responsible for the dissections they do the other 2 days (so you go in on your own or look over it the one day you are there). this is mandatory.
biochem - the workshops are, surprisingly, a little difficult to describe. you go 1 day a week for these too. no partners, it's class work. you cover topics similar to those you're learning in lecture, but do calculations or just talk about them more in depth. it's good because your'e in a small enough group where you can ask questions if you want to. these are mandatory too.
human behavior - everyone thought this would be easy, but it turned out not ot be for many people. don't underestimate it and only study like an hour for the test. with that said, it really isn't a difficult class, and it is onyl an hour, so not worth much, but if you pay attention and give it a little time, it's an easy A. not mandatory (no lectures were for us at least)
interdisciplinary - this is mandatory and if you skip and they take attendance, you have to write a 6 page paper. i'm sure your topics will change. but all the first years from all the programs come and you learn about the others programs, plus there are some different "general health" topics. the point is, we're a health system that needs to talk with other members of it and understand what other members can do for you and your patient.