在家里或菜市场我们看到过剖开的鸡,鸡的肌胃有发达的肌肉,内壁

在家里或菜市场我们看到过剖开的鸡,鸡的肌胃有发达的肌肉,内壁上有一层角质膜,胃腔内有许多砂粒,你认为角质膜和砂粒的作用是(  

 A.刺激胃收缩   B.使胃能蠕动    C.能分泌胃液消化食物  D.磨碎食物

答案

D

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