The Digestive Syste8 - control blood nutrient levels Its...

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The Digestive System Liver The liver receives blood from the hepatic artery and the hepatic portal vein. Bile leaves the liver through the hepatic duct system. The right and left hepatic ducts join to form the common hepatic duct. The cystic duct joins the common hepatic duct to form the common bile duct. The common bile duct joins the pancreatic duct and empties into the duodenum. The liver is divided into lobules with portal triads at the corners. Portal triads contain branches of the hepatic portal vein, hepatic artery, and hepatic duct. Hepatic cords, formed by hepatocytes, form the substance of each lobule. A bile canaliculus, between the cells of each cord, joins the hepatic duct system. Branches of the hepatic artery and hepatic portal vein empty into hepatic sinusoids, which empty into a central vein in the center of each lobe. The central veins empty into hepatic veins, which exit the liver. Pancreas The pancreas is an endocrine and an exocrine gland. Its endocrine function is to
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Unformatted text preview: control blood nutrient levels. Its exocrine function is to produce bicarbonate ions and digestive enzymes. Large Intestine • The cecum forms a blind sac at the junction of the small and large intestines. The appendix is a blind sac off the cecum. • The colon consists of ascending, transverse, descending, and sigmoid portions. • The large intestine contains mucus-producing crypts. • The rectum is a straight tube that ends at the anal canal. Anal Canal • The anal canal is surrounded by an internal anal sphincter (smooth muscle) and an external anal sphincter (skeletal muscle). Peritoneum • The peritoneum is a serous membrane that lines the abdominal cavity and covers the organs. • Mesenteries are double layers of peritoneum that extend from the body wall to many of the abdominal organs. • Retroperitoneal organs are located behind the parietal peritoneum....
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