The mouth of a human being has two pipe like openings. One for air and one for food. Why does food enter only the food pipe and not the wind pipe?

The food enters only into the food pipe and not the wind pipe.The food pipe opens into the digestive tract while the wind pipe opens into the respiratory system.If the food enters into the respiratory system it can choke us or cause other major problems in our body. If the food goes into the food pipe , it canbe digested properly and be used to obtain energy. Therefore, the food enters the food pipe and not the windpipe . 

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because while eating food a flap like  valve present in our throat closes the stream of the wind pipe and the food enters only in the food pipe.Though ,if we talk and eat the valve doesn't get chance to close and the food may enter the wind pipe and we get the choking feeling.
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