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11 Cards in this Set

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pepsin:

*cleaves
*pH optimum
*inactivates at pH
*cleaves: aromatic L-amino acids
*pH optimum: 1-3
*inactivates at pH >5 (e.g., alkaline pancreatic juice in the small intestine)
Vmax is determined by (2)
the number of Na/amino acid co-transporters in the apical membrane

the turnover time of a single Na/amino acid co-transporter
Km is determined by the
affinity of the Na/amino acid co-transporter for amino acids
ingested carbohydrate composition (3)
starch (60%)

sucrose (30%)

lactose (10%)
presence of fats in the duodenum causes release of (2)
CCK

GIP
GIP causes
decreased gastric acid secretion
functions of CCK (5)
slows gastric motility and emptying

stimulates pancreatic enzyme secretion

stimulates intestinal fluid secretion

stimulates gallbladder contraction for bile secretion

relaxes sphincter of Oddi for bile secretion
fat digestion begins with _____ and continues with _____ and _____
lingual lipase

gastric lipase

food-bearing lipases with acidic pH optima
digestion of fats occurs mostly in the
jejunum
enzymes that digest fats in the jejunum (3)
pancreatic phospholipase A2

cholesterol esterase

pancreatic lipase
fat-soluble vitamins (4)
A
D
E
K