"Level of responsibility" was from the health care experience question, correct? I filled this out so long ago I forgot what the questions were (since they weren't long essays and just basic info). If it was, I just stated what my role was in my job and what tasks I was assigned to do, as those were my "responsibilities". If this was a general job question, then I just said what duties I fulfilled in that position and if I oversaw anyone. That's how I would suggest answering that question.
In terms of research, clinical research with patient interactions would qualify has a "health care" experience IMHO. Basic bench research or translational research most likely wouldn't, but you should talk about it elsewhere since it does have a vitally important role in health care, medicine, and science, but it isn't particularly a "health care" experience, which I interpret as them asking if you've had any clinical experience, since they want to know if you've been exposed to the profession as the primary role of a physician is clinical work, unless of course you are applying DO/PhD or seeking some sort of public health/policy type role.
I hope that helps and good luck!
