Digestive System Part 1

why doesn't the stomach digest itself?

Because there is a coat of mucous which cover in inner lining of the stomach

what are the functions of the enzymes in pancreatic juice?

PA breaks down starch and glycogen, PL triglyceride, N nucleic acid, Try Chy Car split proteins

review liver functions

carbohydrate metabolism, lipid metabolism, protein metabolism, storage, blood filtering, detoxification, secretion

What are the secretions of the chief cells and parietal cells?

chief cells secrete digestive enzymes. parietal cells release a solution containing hydrochloric acid

what is the function of cholecystokinin?

decrease the gastric motility as the SI fills with food

which is the most important digestive enzyme in gastric juice?

pepsin

what controls gastric juice secretion?

parasympathetic impulses and hormones

describe the hepatic lobule

a lobule consisting of many hepatic cells radiating outward from a central vein

explain how bile forms

bile is secreted from the liver and is composed of water, bile salts, pigments, cholesterol, and electrolytes

what factors influence how quickly chyme leaves the stomach?

fluidity of chyme and type of food present

how is chyme produced?

mixing movements of the stomach's wall

what regulates secretion of pancreatic juice?

nervous and endocrine systems

list the enzymes in pancreatic juice

pancreatic amylase, lipase, nucleases, trypsin, chymotrypsin, and carboxypeptidase

describe the functions of the gallbladder

store bile between meals, reabsorb water, and contract to release bile into the SI

how is secretion of bile regulated?

the gallbladder is stimulated to contract by hormone. the hepatopancreatic sphincter relaxes as a peristaltic wave approaches it and bile is released.

how do bile salts function in digestion?

they breakdown fat goblets into smaller droplets and enhance absorption of fatty acids, cholesterol, and vitamins a,d,e,and k

locate the liver

upper right quadrant of the abdominal cavity inferior to the diaphragm

which substances can the stomach absorb?

water, certain salts, certain drugs, alcohol