The wall of the alimentary canal consists of four layers, although their characteristics may vary from one organ to another. The innermost lining of the alimentary canal is the mucous membrane, or mucosa. It is a protective layer that may have invaginations that are used for the secretion of mucus and enzymes. Some areas of the mucosa have projections or folds that increase the surface area of the canal for better absorption.
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Digestion Foods: The Best And Worst Foods For Your Digestive System
However, even nutrients that aren’t readily absorbed by the body can be healthy — fiber, for instance, helps to ensure regular bowel movements. Fiber is the “Roto-Rooter, the Drano, of the digestive system,” King says, though she notes that it is possible to have too much. People should generally have between 20 to 30 grams of fiber each day, which is the amount in five to seven servings of fruits and vegetables and about four to five servings of whole grains. The body is designed to digest many types of foods, but everyone is different in that some foods may trigger digestion-related symptoms for some and not others, Bechtold says.
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Human Digestive System Functions
Features Several important features of the digestive tract allow it to function. The stomach cells secrete strong acid, explains Dr. Lauralee Sherwood in Human Physiology. This helps break down food molecules into nutrients that can be absorbed. The pancreas, a digestive organ, secretes digestive enzymes into the intestine that also participate in the chemical breakdown of food. Finally, the lining of the small intestine is very convoluted and has a large surface area, making it ideal for absorption functions. Time Frame Individuals vary somewhat in the amount of time it takes their digestive tracts to complete work on a particular mealthe meal in question also plays a role in determining how long it spends in the digestive system.
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