I've decided to keep everything lowercase where possible, and if there are any shorter inputs you would prefer instead of larger ones --> e.g. "integumentary" instead of "integumentary system", please chat to me on the forums. Cheers.
11/02/14: Happy New Year - I'm back to fixing this course as time permits. Just want to say a big thanks for the amount of participants (wow!) and also the helpful suggestions in the forums. The first 11 sections are fine. I will revise the later sections.