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这是消化系统英语ppt，包括了The digestive system consists of the，the Alimentary Tract，the Accessory Organs等内容，欢迎点击下载。
消化系统英语ppt是由红软PPT免费下载网推荐的一款课件PPT类型的PowerPoint.
The digestive system is responsible for breaking down food， absorbing nutrients from the food， and ridding the body of waste products from the food. It is roughly nine meters long and begins at the mouth and ends at the anus. The digestive system consists of the: the alimentary tract mouth， pharynx ， esophagus， stomach， small and large intestines， rectum and anus the accessory organs salivary glands， liver， gall bladder and pancreas the Alimentary Tract The mouth， or oral cavity， is the first part of the digestive tract. It is adapted to receive food by ingestion， break it into small particles by mastication， and mix it with saliva. The lips， cheeks， and palate form the boundaries. The oral cavity contains the teeth and tongue and receives the secretions from the salivary glands. Kids have 20 teeth， but by the time they are fully grown， they should have 32 teeth (some people do have less!). The esophagus is the second step to digestion and closely follows the oral cavity – once swallowing has initiated.
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