Indicate true (T) and false (F) statements below regarding the pattern of cell proliferation in the epithelium that forms the lining of the small intestine. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTT.
( ) New epithelial cells are constantly born throughout the epithelial sheet, mostly at the villi.
( ) Every type of intestinal epithelial cell is eventually discarded into the gut lumen where they die.
( ) There is a net movement of cells from the bottom of the crypts up toward the tip of the villi.
( ) The majority of intestinal epithelial cells have packed microvilli on their apical surfaces.