Describe the characteristics,location,and function of columnar epithelium.

(N/A) $\rightarrow$ The columnar epithelium is composed of a single layer of tall and slender cells. Their nuclei are located at the base.
$\rightarrow$ The free surface may have microvilli.
$\rightarrow$ Their inner ends are narrow,and the free ends are broad and polygonal.
$\rightarrow$ Location: They are found in the lining of the stomach and intestine.
$\rightarrow$ Function: They help in absorption and secretion.