The Vertebrate (mostly human) Digestive System Mouth ...
The Vertebrate (mostly human) Digestive System Mouth ...
The Vertebrate (mostly human) Digestive System Mouth ...
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EsophagusUpper 1/3 of esophagusenveloped in voluntaryskeletal muscleLower 2/3 enveloped ininvoluntary smoothmuscleFood propelled byperistaltic waves ofmuscular contractionsEntry of food into stomach controlled by gastric sphincter -prevents food in stomach from re-entering esophagus