The tubule consists of simple epithelium: the _____ or _____ surface of the epithelial cells contacts the filtrate in the lumen, while the _____ or _____ surface contacts the interstitial fluid surrounding the tubule.

3000+ review questions on anatomy and physiology. 

Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.