Role of Salivary Glands, Stomach, Liver, and Lipoproteins in Digestion and Metabolism - Pr, Study notes of Biology

Download Role of Salivary Glands, Stomach, Liver, and Lipoproteins in Digestion and Metabolism - Pr and more Study notes Biology in PDF only on Docsity! 21 March Endocrine – secreted into blood Exocrine – secreted into duct Salivary glands ANS stimulus (autonomic nervous system) Exocrine: saliva, mucus, amylase Stomach Stimulus: food Regulated by ANS and ENS (enteric) Endocrine: gastrin → ↑ HCl, motility; histamine → ↑ HCl Exocrine: pepsinogen → pepsin (from chief cells, transformed by pepsin, HCl); mucus SI mucosa Stimulus: chyme Endocrine: secretin, CCK; both inhibit gastrin, histamine CCK acts on pancreas Enterokinases – activate zymogens Pancreas Stimulus: CCK → zymogens (trypsin, chymotrypsin, amylase, lipase, carboxypeptidase) Stimulus: secretin → bicarbonate Liver Bile Objectives Understand functions of liver related to metabolism Understand blood supply to liver (hepatic portal vein, hepatic artery, entero hepatic circulation) Understand absorption of fatty acids Understand what lipoproteins are and their transport Understand cholesterol balance Understand the relationship between fat and glucose metabolism Liver – metabolic organ Detoxification Synthesize bile salts (entero-hepatic circulation) – lipid metabolism Glycogen store Hepatic Portal System Most fluid is absorbed in the small intestine Figure 15.30 Amino acids, sugars, fatty acids Portal triads Branch of bile duct Hepatic portal vein Hepatic artery