Final answer:
The simple columnar epithelial cell is the most common cell type in the simple epithelia of the mammalian small intestine, specialized for nutrient absorption, while goblet cells secrete mucus.
Step-by-step explanation:
Common Cell Types in Simple Epithelia of the Small Intestine
The most common type of cell found in the simple epithelia of the mammalian small intestine is the simple columnar epithelial cell. These cells are characterized by their height, being taller than they are wide, with nuclei that align at the base of the cell. They are crucial for the absorption of nutrients due to the presence of microvilli, which increase the surface area for more efficient absorption. Embedded among the columnar epithelial cells are goblet cells, whose primary function is to secrete mucus into the lumen of the digestive tract, aiding in lubrication and protection.