why swallowing and breathing cannot occur simuntaneously?

Epiglottis is the part of your body that flops down over the windpipe when you swallow to keep food from going into your oesophagus and not into windpipe. So when we eat, the Epiglottis has closed the flap which means the path to windpipe is blocked and breathing can't performed.Hence,breathing and swallowing cannot be done simultaneously.

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The epiglottis is a flap that is made of elastic cartilage tissue covered with a mucous membrane, attached to the entrance of the larynx.

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in our body a cartilagenous flap like structure present called epiglottis. it prevents the food from entering into the windpipe,when we are swallowing.
thats why breathing cannot be performed while we swallowing the food
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