Why are there so many phagocytic cells (in lymph nodes and the liver, for example) associated with the digestive system?
A. They stimulate contractions of the tunica muscularis.
B. They stimulate proliferation of stem cells.
C. They remove bacteria and other foreign material ingested with food.
D. They can transform into other cell types under the appropriate hormonal stimulation.
E. They stimulate digestive enzyme production.
Answer: C
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