This lesson introduces the structures and functions of the digestive system.
The following are the functions of the digestive system:
The digestive system consists of the digestive tract, which is a tube extending from the mouth to the anus, and the associated organs, which secrete fluids into the digestive tract. The term gastrointestinal tract technically refers to only the stomach and intestines.
Food takes the path outlined below as it moves through the body.
The oral cavity, or the mouth, is the first part of the digestive system. It is bounded by the lips and cheeks and contains the teeth and tongue. Its primary function is to masticate, or chew, and moisten the food.
The pharynx, or throat, connects the mouth to the esophagus.
The esophagus is a muscular tube about 25 centimeters long. Food travels down it to the cardiac sphincter of the stomach.
The stomach is an enlarged segment of the digestive tract.
The opening of the stomach is the cardiac sphincter.
The muscular layer of the stomach is different from other regions because it has folds called rugae that increase the surface area.
The exit of the stomach is the pyloric sphincter.
The small intestine is about 6 meters long and consists of three parts: duodenum, jejunum, and ileum.
The large intestine consists of the cecum, colon, rectum, and anal canal. The cecum is located where the small and large intestine meet.
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Digestive organs include structures such as villi and rugae. Which of the following is a purpose they serve? (Check all that apply).