anatomy hell

I hate my current anatomy professor. I have completed two essays so far for my class (yes I have to write essays for a science class. yes its ridiculous but that is what rio salado expects in all its classes. apparently its supposed to help us apply the information we are learning. total crap!). anyway, the first essay which was on someone having a problem with their parathyroid gland and I had to say what the problem was based off their symptoms and possible treatment options (don't get me started on how I am not a doctor nor in medical school so i couldn't even begin to give treatment ideas). I felt I answered the stated question very clearly and yet i received a D grade. my professor said i didn't tell her where the parathyroid was located and i should put that in so my reader will know that i know what I am talking about. For crying out loud! she is my reader and should already know where the heck this gland is located. I am not about to put extra information in just to make myself sound smarter or make my essay longer.
Then on this second essay which was about a baby that had its pulmonary vein and aorta switched, she says pretty much the same stuff as on the last one and even put in information that apparently I should have known about the circulation except that we hadn't learned about the blood vessels yet and how the hell should i know it. I got a D- for this essay.
I am trying my best and its not easy when I have shortened weeks to do these essays since I'm on the Trail half the time. Maybe I could do a bit better but I don't know how. She isn't very forthcoming on helpful information.
In my last anatomy class, my first essay would have received a B and the second a B-, at the least, but this professor expects higher level answers then what I am able to give based on the fact that I am not a graduate student. At this point I only have three more essays left and I don't care about them anymore. maybe i won't even do them because apparently what I am doing isn't even good enough to get a C. I can't wait for the professor review at the end of the semester.