large intestine
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Nondigestible materials, such as fiber, are broken down primarily in the large intestine by gut bacteria through fermentation. This process produces short-chain fatty acids and gases like methane and hydrogen, which can be absorbed or excreted by the body.
A nondigestible plant polysaccharide is called a dietary fiber. These are carbohydrates that cannot be broken down by human digestive enzymes, and they play important roles in supporting digestive health and overall well-being.
The large intestine, specifically the colon, reabsorbs water from nondigestible material that passes through the digestive system. This helps to form solid feces by removing excess water and maintaining the body's hydration balance.
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The nondigestible part of certain foods that aids in moving food through the digestive tract is fiber. Fiber helps to add bulk to stool and facilitate smooth movement through the intestines, promoting regular bowel movements and overall digestive health.
Fungi and bacteria eat things. Decay is caused by the growth and reproduction of these decay organisms, which are eating the material which is decaying. You don't see individual bacteria at work because they are microscopic, and you don't clearly see fungi at work, because most of what they are doing is hidden, but you see the result, in the form of decay.