Because of your immune system. Your immune system can fight off anything trying to do anything bad, Not all bacteria is bad for you.
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Bacteria in your digestive system can be beneficial by aiding in digestion, producing essential vitamins, and competing with harmful bacteria for resources. The balance of "good" and "bad" bacteria in your gut helps to maintain a healthy microbiome, which can protect against pathogens.
The acid in your stomach kills bacteria and helps keep your digestive system healthy.
The stomach acid kills bacteria in the stomach and helps maintain a healthy digestive system.
The cecum and appendix in the digestive system serve as reservoirs for beneficial bacteria and aid in immune function.
One example of a monera is the bacteria species Escherichia coli, commonly found in the human digestive system.
The digestive system depends on the nervous system to signal the release of digestive enzymes and control movement of food through the digestive tract. It also relies on the circulatory system to transport nutrients and water absorbed in the digestive process to other parts of the body. Additionally, the immune system plays a role in protecting the digestive system from pathogens and maintaining a healthy balance of gut bacteria.