This is something I used when I was a student. I've briefly looked it over, and there's only a line drawn on the third page (I'm also a bit embarrassed, wondering why I only marked such a random spot). From a layman's perspective, the rest of the book seems to be in good condition. I hope it can be useful to students who need it for their studies. Thank you. #Science #SpecializedBooks #Physiology #Biology