Nine liters (over two gallons) of water enter the intestines each day from the blood and by ingestion. Active transport of nutrients, ions, minerals, etc., into intestinal cells lowers the _____, and so water enters the cells as well.

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.