The function of a third, obliquely-oriented layer of smooth muscle in the muscularis externa of the stomach is to ________
A) churn, mix, and pummel the food contents to reduce them to small fragments
B) carry waves of contraction around the stomach
C) squeeze the stomach to reduce its size after a meal has emptied from it
D) allow stronger contractions than those occurring in other parts of the alimentary canal
Answer: A
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