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The acidic solution within the stomach also kills most of
the bacteria that are ingested with the food. The few bacteria
that survive the stomach and enter the intestine intact
are able to grow and multiply there, particularly in the
large intestine. In fact, most vertebrates harbor thriving
colonies of bacteria within their intestines, and bacteria are
a major component of feces. As we will discuss later, bacteria
that live within the digestive tract of cows and other ruminants
play a key role in the ability of these mammals to
digest cellulose.
Ulcers
Overproduction of gastric acid can occasionally eat a hole
through the wall of the stomach. Such gastric ulcers are
rare, however, because epithelial cells in the mucosa of the
stomach are protected somewhat by a layer of alkaline
mucus, and because those cells are rapidly replaced by cell
division if they become damaged (gastric epithelial cells
are re

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