Mechanical breakdown of food is a function of the
a. large intestine.
b. liver and pancreas.
c. mouth and stomach.
d. esophagus and mouth.
C
Mechanical breakdown of food occurs in the mouth during chewing and in the stomach as the food is mixed by muscular action. By the time food reaches the large intestine it is already bro-ken down and most of the nutrients have been absorbed. The liver and pancreas produce secre-tions that help with chemical but not mechanical breakdown of food. Food passes through the esophagus largely unchanged so it is not involved in breakdown.
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