Histology Small Intestines: The small intestines histology features villi and microvilli on its mucosal surface, which greatly increase the surface area for nutrient absorption; it also contains glands and lymphatic structures for digestion and immune defense.
The Absorptive Stage: During the absorptive stage, which occurs while nutrients are being digested and absorbed, the body uses glucose as its primary energy source and stores excess nutrients as glycogen and fat under the influence of insulin.