The Digestive System Is Considered a Natural Nonspecific Defense System

Multiple Choice

The digestive system is considered a natural nonspecific defense system against microorganisms as a result of:

A) the esophagus produces acid that kills microorganisms prior to establishing a gastrointestinal infection.
B) the peristalsis of the intestines prevents attachment of organisms that are capable of surviving the acidic pH of the stomach.
C) most organisms are resistant to the digestion by normal gastrointestinal secretions.
D) the organisms are killed by exposure to saliva and pancreatic secretions before and after leaving the stomach.