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The large intestine isn’t just passive tubing — it’s actively moving contents through rhythmic muscular waves called peristalsis. This motion is controlled by the enteric nervous system, an intricate mesh of neurons running through the intestinal wall. It functions largely on its own but is modulated by both sympathetic and parasympathetic input. The abdominal nervous system is key to coordinating gut motility, secretion, and communication with the central nervous system — via the vagus nerve an
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The small intestine absorbs nutrients, water, and salt from digested food. This process occurs through the inner walls of the small intestine, which are covered with finger-like projections called villi and microvilli. How absorption occurs 1.Food is broken down into nutrients like amino acids, fatty acids, and simple sugars. 2.Nutrients pass through the epithelial cells of the gastrointestinal tract. 3.Special cells help nutrients cross the intestinal lining into the bloodstream. 4.The circulat
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