Digestive enzyme secretion

Question 1

What forms are the enzymes secreted in

Answer 1

The enzymes secreted are either active or precursors (secreted in inactive form (zymogens) similar to pepsinogen)

Question 2

What secretes the enzymes

Answer 2

They enzymes are secreted by gland cells at the pancreatic end of the duct system

Question 3

What does the presence of amino acids and fatty acids in the small intestine cause

Answer 3

The release of gastrointestinal hormone CCK (produced in the small intestine)

Question 4

What does CCK do

Answer 4

stimulatesthe secretion of digestive enzymes and also potentiates the actions of SECRETIN (which stimulates bicarbonate secretion from the pancreas & liver)

CCK also stimulates the contraction of the gall bladder and relaxes the sphincter of Oddi

Question 5

What do the enzymes that the pancreas secretes do to
Tryglycerides
saccarides
and proteins

Answer 5

The enzymes the pancreas secretes digest triglycerides (fat) to fatty acids & monoglycerides, polysaccharides to sugar, proteins to amino acids & nuclei acids to nucleotides

Question 6

What two active enzymes does the pancreas secrete

Answer 6

Alpha amylase

lipase

Question 7

Function of Alpha Amylase

Answer 7

Converts starch —> maltose (glucose disaccharide)

Question 8

Function of Lipase

Answer 8

Converts triglycerides —> monoglyceride & fatty acids

Question 9

Why does the pancreas secrete zymogens

Answer 9

Like pepsinogen, the secretion of zymogens protects pancreatic cells from autodigestion

Question 10

Where is enterokinase found

Answer 10

which is embeddedin the luminal plasma membranes of the intestinal epithelial cells

Question 11

what is enterokinase and what does it do

Answer 11

Enterokinase is a proteolytic enzyme that splits off a peptide from pancreatic trypsinogen forming the active enzyme TRYPSIN

Question 12

What is trypsin and what does it do

Answer 12

Trypsin is another proteolytic enzyme which in turn goes on to activate other pancreatic zymogens once activated by splitting off peptide fragments e.g. in the case of chymotrypsinogen which is activated into the enzyme CHYMOTRYPSIN

Question 13

Function of both trypsin and chymotrypsin

Answer 13

Both trypsin & chymotrypsin are enzymes used to break peptide bonds in proteins to form peptide fragments i.e. they digest ingested proteins