PATHOLOGY

Detailed explanation-1: -Stomach and bowel: Stomach acid kills many bacteria soon after they enter your body. You also have beneficial (good) bacteria in your intestines that kill harmful bacteria.

Detailed explanation-2: -The secretion of hydrochloric acid by the stomach plays an important role in protecting the body against pathogens ingested with food or water.

Detailed explanation-3: -The hydrochloric acid in the gastric juice breaks down the food and the digestive enzymes split up the proteins. The acidic gastric juice also kills bacteria.

Detailed explanation-4: -Many microbes can enter the stomach, but most of them end up getting degraded by the low pH acidity of the stomach. Helicobacter pylori, and Clostridium botulinum are microbes that can survive the acidic environment of the stomach and induce deadly effects to the host.