Download Salivary Amylase

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Hydrochloric acid wikipedia, lookup

Pancreas wikipedia, lookup

Bile acid wikipedia, lookup

Transcript
DIGESTION SUMMARY
MOUTH
 Salivary gland
 Starch –Amylase maltose
STOMACH
 Hydrochloric acid
 Gastric juices – controlled by hormone called Gastrin – food in mouth
 Pepsinogen –contact with acid Pepsin
 Proteins –pepsin polypeptides
 Mucin – forms a layer of mucus
 After 3-4 hours - chyme
DUODENUM
 Pancreas
o Starch –amylase Maltose
o Lipids –Lipase Fatty acids and glycerol
o Trypsinogen –activated by enterkinase made in intestinal glands Trypsin (endopeptidase)
o Chymotrypsinogen – trypsin activates  Chymotrypsin (exopeptidase)
o Proteins –(Trypsin + Chymotrypsin) polypeptides + amino acids
 Liver
o Bile Emulsify fats  micelles
o Sodium hydrogen carbonate - Neutralises acidic chime
SMALL INTESTINE
 Wall of Small Intestine
o Pancreozymin (CCK) – is produced when fat-rich chime enters the duodenum. Triggers
release of pancreatic enzyme and release of Bile.
o Secretin – triggered from acidic chime - stimulates flow of hydrogen carbonate ions from
pancreas
o Enterkinase – activates trypsinogen  trypsin
o Starch –amylase maltase
o Maltase –maltose glucose
o Sucrose –sucrase  glucose and fructose
o Lactose –lactase glucose and glactose
o Dpeptides –peptidase amino acids
o Peptides –aminopeptidase amino acids
o Nucleotides—neucleotidase organic base + pentose sugar + phosphate

Absorption
o Epithelium secretes sodium and chloride ions into the lumen  water potential gradient 
water moves into lumen by osmosis
o Absorption of glucose
 Sodium is responsible for the absorption of water, amino acids and glucose
 Glucose is absorbed by active transport – requires sodium dependent glucose
transporters – proteins transport both sodium and glucose into the cell
 Once inside the epithelium, glucose and sodium must be exported from the cell into
the blood – diffusion
 Other monosaccharides such as fructose are not absorbed by active transport
o Absorption of amino acids
 Sodium-dependent amino acid transporters
 Active transport of sodium and amino acids
o Absorption of Lipids
o Emulsification  bile salts and lipids  micelles
o Fatty acids and monoglycerides are absorbed by simple diffusion across plasma membrane
LARGE INTESTINE
 Water and electrolytes (i.e. sodium and chloride) are absorbed
 Na+ transported from lumen by sodium pumps, water follows by osmosis
 Bicarbonate is secreted to neutralise acids generated from microbes