The intestinal wall lined with 4 to 5 million finger-like projections are called ________________.

Correct option is B

The villi are finger-like projections found on the lining of the intestinal wall. They increase the surface area for absorption of nutrients in the small intestine. Each villus contains tiny hair-like structures called microvilli, which further increase the surface area for nutrient absorption.
Information Booster: The villi in the small intestine are crucial for nutrient absorption. They are covered with epithelial cells that contain microvilli. The increased surface area provided by the villi and microvilli allows for efficient absorption of nutrients such as carbohydrates, proteins, fats, vitamins, and minerals from digested food.
Additional Knowledge:
· Cilia: Cilia are hair-like structures that move substances across cell surfaces but are not involved in nutrient absorption in the intestines.
· Pseudopodia: These are temporary projections of the cytoplasm used by some cells for movement or engulfing food, primarily found in amoebas and similar organisms.
· Cristae: These are folds in the inner membrane of mitochondria, involved in cellular energy production, not related to nutrient absorption.
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