问题
单项选择题
肛门内括约肌的功能及其构成如下，其中哪一项说法是错误的（）
A.内括约肌是直肠末端增厚的环形肌，为平滑肌
B.内括约肌内仅有少量神经节细胞，属植物神经支配
C.使肛门口常处在收缩状态，防止粪溢
D.当直肠下段受到膨胀刺激后，发生反射性松弛
E.在粪便控制中起重要作用
答案
参考答案：E
解析：排便控制主要是肛门外括约肌起作用。
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肛门内括约肌的功能及其构成如下，其中哪一项说法是错误的（）
A.内括约肌是直肠末端增厚的环形肌，为平滑肌
B.内括约肌内仅有少量神经节细胞，属植物神经支配
C.使肛门口常处在收缩状态，防止粪溢
D.当直肠下段受到膨胀刺激后，发生反射性松弛
E.在粪便控制中起重要作用
参考答案：E
解析：排便控制主要是肛门外括约肌起作用。
| 阅读短文, 从ABCD 选项中选择最佳答案. | |||
| Kate___1___from America . She is America . She __2_____ English .She can also speak ___3___Chinese .She ___4__ in Beijing now . She __5___ in a middle school . She ___6___ classes ___7___ weekends . She often goes to school ___8___ . She often helps her mother go shopping ___9___ Sundays . Her father __10____ in Beijing .He __11____ English . Her mother also __12____ in Beijing . They __13____ Chinese food , and __14____like China . TheChinese people are __15____ to them . | |||
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