The fact that the epithelial layer of the digestive system plays an essential role in both protecting the body from unwanted or toxic items consumed as well as enabling the essential nutrients to be absorbed relies on the existence of which of the following? (Check all that apply)
Tight junctions between epithelial cells
An abundance of collagen and elastin
Specific carriers or transporters for essential substances
Fenestrations or leaky holes between epithelial cells
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