Hehe, this is a great question.
There's a reason it's not required, but only suggested.
The grossly oversimplified short & sweet answer is: If you take it, you're more likely to get a C or above. If you don't, you're more likely to get a C or below. It really doesn't seem to make a huge difference.
There were 2 people (out of 130!!) as far I as know that got A's in Small Animal anatomy in our class, and neither of them had had anatomy before. It just appealed to them, they were insanely into it, much to the loss of grades of their other classes. Then when large animal anatomy was next, one of the girls told me she had zero interest in large animal anatomy and made a C. The other girl just gets A's & B's in everything. She is a machine & I don't know how she does it.
I personally didn't take the summer anatomy class, and all during that 1st semester I wished I had. I still got a C though.
Then I looked around and noticed that folks who had taken the class were working just as hard as me. A girl in my dissection group had taken the course and she was just as clueless as me.
Looking back, I'm really glad I didn't and just enjoyed my summer.
Anatomy is a monster of a course. Everyone struggles with it. It truly is one of those things where you get back what you put in. I would think you would have to work hard over the summer, and work hard again during the fall semester.
Honestly I think taking a Latin course would serve you better. Because that will help you in all of your courses. Same with medical terminology.