题目内容
Bile contains ______,_____and ______ . It has a detergent-like effect on fats.
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The mouth receives food, a process called__________.It breaks food into small portions. This is done mainly by the teeth in the process of chewing or__________, but the tongue, cheeks, and lips are also used. It moves proper amounts of food toward the throat to be swallowed, a process called __________.
The mouth mixes the food with __________, which is produced by the __________glands and secreted into the mouth. __________ lubricates the food and has a digestive enzyme called __________ amylase, which begins starch digestion.
The abdominopelvic cavity is lined with a thin, shiny serous membrane that also folds back to cover most of the organs contained within the cavity. The outer portion of this membrane, the layer that lines the cavity, is called the parietal __________; that covering the organs is called the visceral __________. This slippery membrane allows the organs to slide over each other as they function. The__________ also carries blood vessels, lymphatic vessels, and nerves.
The digestive tract is a muscular tube extending through the body. It is composed of several parts: the mouth, __________, __________, __________, __________, and __________.
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