Biology Questions and Answers
Besides making bile for release in the
duodenum, the liver has otfunctions. her digestive
The venous nnutrients from thetwork that ae guts, calledbsorbs
mesenteric circulation, drains its blood
content almostportal vein. This vein irrigates the liver entirely to the hepatic (^)
with absorbed material from the
digestion.of storing, processing a So the liver has the nd inactivatingfunctions
nutrients.
Glucose is polymerized into glycogen in
the liver; vitamins and the iron absorbed in thethis organ also stores many (^)
intestine. Some important metabolic
molecules, like factors, are made in the liver fromalbumin and clotting
amino acids of the diet. In the liver
ingested toxicand drugs, are substances, like inactivated too.alcohol
- Besides the liver which is
the other adnexal gland of the
digestive system that releases
substances in the duodenum
participating in extracellular
digestion?
The other adnexal gland of the digestive
system ismakes digestive enzymes that d the pancreas. This organigest (^)
proteins (proteases), lipids (lipases) and
carbohydrates (pancreaticOther digestive enzymes, like amylases).
gelatinase, elastase, carboxipeptidase,
ribonuclease analso secreted by the pancreas.d deoxyribonuclease are
- How does the pancreatic
juice participate in the
digestion of proteins? What
are the involved enzymes?
The pancreasundergoing action o secretes trypsinf the enzymeogen that,
enterokinase secrduodenum, is transfeted by theormed into trypsin. (^)
Trypsin in its turn catalyzes the
activationchymotrypsinog of pancreaticen into chymotrypsin. (^)
Trypsin and chymotrypsin are proteases
that break proteins into smallerpeptides. The smaller peptides are (^) then
broken into amino acids by the enzyme
carboxipeptidase (also spancreas in a zymogen form anecreted dby the
activated by trypsin) helped by the
enzyme aminointestinal mucous mpeptidase maembrane.de in the
- How does the pancreatic
juice resume the digestion of
carbohydrates? What is the
involved enzyme?
Carbohydrate daction of the salivaryigestion be amylasegins with th (ptyalin)e
in the mouth and it continues in the
duodenum by the action opancreatic juice. This juice contains thf the (^) e
enzyme pancreatic amylase, or
amylopsin, that brinto maltose (a disaccharide madeaks starch (amylum)e of
two glucose molecules).
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