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.

Question

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.

Quizplus · Accepted Answer

The microvillus-containing absorptive epithelial cells of the small intestine (as well as goblet cells and enteroendocrine cells) travel mainly upward from their site of birth in the crypt, through the plane of the epithelial sheet, toward the tip of the villi where they die by apoptosis and are discarded into the gut lumen. However, some of the epithelial cells in the crypt remain there as stem cells.

Indicate True (T) and False (F) Statements Below Regarding the Pattern