Identify three ways the small intestine is modified to increase the surface area for digestion and absorption.
What will be an ideal response?
The plicae circulares, villi, and microvilli are modifications of the small intestine for digestion and absorption. The plicae circulares are circular folds of the mucosa and submucosa. They force chyme to move spirally through the lumen. The villi are fingerlike projections of the mucosa. They increase the absorptive surface area. Microvilli are projections of the plasma membrane of the absorptive cells of the mucosa that bear intestinal digestive enzymes. They also increase surface area and enhance absorption.
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A) Rinne test B) Barany test C) audiometry test D) Weber test