Brush border of small intestine cells are formed of

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Microvilli

Cilia

Villi

Circular folds

answer is A.

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Detailed Solution

Concept: The small intestine is an organ in the digestive system located halfway between the stomach and the large intestine. In terms of functionality, the small intestine plays a major role in the absorption and digestion of food. It gets bile and pancreatic secretions through the hepatopancreatic duct, which aids operations.
The deepest layer bordering the alimentary canal lumen is called the mucosa. This layer develops irregular folds (rugae) in the stomach and tiny finger-like folds (villi) in the small intestine.
The cells lining the villi create microscopic projections known as microvilli, which give some epithelial cells' apical surface the appearance of having a brush border.
Hence, option 1 is the correct answer.

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