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17. 碳水化合物(请写完整不要缩写)
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III. 将选的词填入横线上 （注意采取词的适当形式。）jejunumduodenumileumrectumcecumanusparotidsublingualsubmandibularptyalinbilesigmoid colon1. The18gland is located in front of the ear, while the19gland is located beneath the tongue.2. While the chyme enters the20, the second part of the small intestine, absorption of the digested food occurs.3. The first part of the colon, the21 , is situated below the place where the large and small intestines join.4. Once feces are pushed to the22 , they will trigger the defecation reflex.5. The hepatic function most directly related to digestion is the secretion of23 .18.
The digestive tract consists of the mouth, the esophagus, the stomach , small intestines, large intestines, rectum and anus.
There are three salivary glands in the oral cavity.
The stomach, which both stores food and continues the chemical reduction begun in the mouth, looks like a J-shaped bag.
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