Hi Elizabeth:
Some resources may be right where you work. I am taliking about other teachers who instruct various medical vocations. If you invited one of these teachers to come and speak about their specialty, and asked them to "lay on the terminology related to their field", I am quite sure your students would begin to see that terminology plays a gigantic role in the medical profession, and it's vital they become familiar with as much terminolgy as possible.
As a field trip, you could do the same thing at a local clinic or hospital department where the purpose would be to tour, but the hidden agenda would be to be exposed to many new and some unfamiliar terms. You could ask your students to keep track of say, 5-10 unfamiliar terms they heard, then look them up and define them when they returned to class following the field trip.
Regards, Barry