Chapter 14

Describe the types of motility in each component of the digestive tract. What factors control each type of motility?

Describe the process of mucosal turnover in the stomach and small intestine.

Why are some digestive enzymes secreted in inactive form? How are they activated?

The number of immune cells in the gut-associated lymphoid tissue (GALT) housed in the mucosa is estimated to be equal to the total number of these defense cells in the rest of the body. Speculate on the adaptive significance of this extensive defense capability of the digestive system.