DigestiveSyst.PartII

DigestiveSyst.PartII - Continuation of the Digestive System...

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Continuation of the Digestive System Small Intestines -Duodenum -About 10 in-1ft long -“Mixing bowl” where chime is mixed with pancreatic secretions and bile (from liver) -Secretes several important hormones: CCK (cholecystokinin) GIP (gastric inhibitory peptide) Secretin VIP (vasoactive intestinal peptide) -Contains Brunner’s glands Make mucus, which protects lining and buffers chime. Pancreas -Has exocrine and endocrine functions -Exocrine fxn: cells of pancreatic acini make digestive enzymes and buffers. It dumps them into duodenum via pancreatic duct. Pancreatic Juice includes: 1. Alpha-amylase breaks down carbohydrates (similar to saliv. Amylase) 2. Lipase breaks down complex lipids 3. Nucleases break down nucleic acids (DNA, RNA, etc.) 4. Proteases and Peptidases proteolytic enzymes (break down proteins) a. Don’t need to know specific names 5. Bicarbonate and Phosphate buffers increase pH to 7.5-8.8. Liver-has four lobes. The little pouch is the gallbladder -The liver is very vascular-lots of vessels inside -Kupffer cells-immune, phagocytic cells and Hepatocytes-liver cells -Liver lobule functional unit of the liver. -The liver is a major destination for digestive system venous blood—all of the blood
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DigestiveSyst.PartII - Continuation of the Digestive System...

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