Here is a breakdown of the MS I's current winter quarter schedule that I posted elsewhere but I figured it would be useful here too.
Righto, well I'll break down our current schedule for you. Take a peak at it and it will help you.
http://www.midwestern.edu/x1874.xml
So for biochem we have lectures which are not mandatory but they give us little extra credit assignments in class about 4 times a quarter which can raise your grade 3% or so at the end. So it's really up to you if you want to go or not. The Biochem classes located in AH (Hyde Atrium) are mandatory in that we have simulated patient cases and you are working with your groups.
Physiology is not mandatory except for Tuesday mornings where we have the case sessions. Even then the class is split in half and you only have your case session for one hour in the block of 8-10am.
Anatomy lecture is not mandatory. Lab however is, out of the 3 scheduled lab times a week you will be in lab 2 of those days. The other day you are scheduled to attend case studies which they encourage us to go to and the material is often on the tests but it is not totally mandatory.
OMM has a lecture for the first hour 8-9 that is highly encouraged but no one takes attendance. Lab from 9-12 you take a quiz in the beginning worth 5 pts (vs tests worth 100 i think) and you sign in at the end to get your points for that day. If you miss a day it's not the end of the world but it's really hard to get the techniques down if you don't go to lab so essentially everyone goes.
ICM sometimes has a lecture for the first hour which isn't mandatory and then the class is split into two and one half goes to lab to work on skills like auscultating, BP etc while the other has a case pertaining to what you learned that day. Sometimes there is no lecture in the beginning and it is just the two groups one in lab and the other in case session.
The weird pt-physician dialogue is suppose to be mandatory but we don't know how they are planning on enforcing that so a lot of people don't go.
If you have any more specific questions just let me know.