The semester is days away, which means that Anatomy and Physiology profs, TAs, and lab rats everywhere are dusting off histology slides. Get a preview of epithelial tissue, before the madness begins with this new episode of Lab Rats! . Definition, functions, special adaptations, and classification. Free “start of semester pep talk” if you get to the end. reference: 8th edition Martini, Timmons and Tallitsch’s Human anatomy.