The Digestive Syste6

The Digestive Syste6 - the release of pancreatic enzymes...

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The Digestive System Small Intestine Secretions of the small intestine. o Mucus protects against digestive enzymes and stomach acids. o Chemical or tactile irritation, vagal stimulation, and secretion stimulate intestinal secretion. Movement in the small intestine. o Segmental contractions occur over short distances and mix the intestinal contents. o Peristaltic contractions occur the length of the intestine and propel chyme through the intestine. Most absorption occurs in the duodenum and jejunum. Liver The liver produces bile, which contains bile salts that emulsify fats. The liver stores and processes nutrients, produces new molecules, and detoxifies molecules. The liver produces blood proteins. Pancreas The pancreas produces bicarbonate ions and digestive enzymes. Acidic chyme stimulates the release of a watery bicarbonate solution that neutralizes acidic chyme. Fatty acids and amino acids in the duodenum stimulate
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Unformatted text preview: the release of pancreatic enzymes. Large Intestine • The function of the large intestine is feces production and water absorption. • It takes much longer for material to move through the large intestine than the small intestine. • In the colon, chyme is converted to feces. • Mass movements occur three to four times a day. • Defecation is the elimination of feces. Reflex activity moves feces through the internal anal sphincter. Voluntary activity regulates movement through the external anal sphincter. Digestion, Absorption, and Transport • Digestion is the chemical breakdown of organic molecules into their component parts. After the molecules are digested, some diffuse through the intestinal wall; others must be transported across the intestinal wall....
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