I agree with Buc. Don't try to speak on things you don't know. You will lose credibility and look foolish. They are smart guys and understand you don't have a Phd in medicine; they get it. Just do your best to learn from them. They will be engaged and happy to answer any questions you may have, as long as you are sincere in your questioning. This is an awesome opportunity to LEARN cool doctor shit.
Basically, if there is something you have a question on, don't shake your head like you know what their talking about. Ask them. That way the next time it comes up, you CAN shake your head like you know what their talking about. Heres a trick, people tend to look smarter when they actually are smarter

Have fun and good luck man. Sounds like a good new job.