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
