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8 Cards in this Set
- Front
- Back
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what enzyme begins starch digestion
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Salivary amylase
Starch digestion begins in the mouth, where salivary α-amylase hydrolyzes the internal (α1→4) glycosidic linkages of starch, producing short polysaccharide fragments or oligosaccharides. |
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What enzyme converts starch to oligoscaccharides?
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Pandcreatic amylase
Pancreatic α-amylase yields mainly maltose and maltotriose (the diand trisaccharides of glucose) and oligosaccharides called limit dextrins, fragments of amylopectin containing (α1→6) branch points. |
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what hydrolyzes the Oligosaccharides, Maltos and dextrins to glucose?
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SI brush border enzymes
Maltose and dextrins are degraded to glucose by enzymes of the intestinal brush border (the fingerlike microvilli of intestinal epithelial cells, which greatly increase the area of the intestinal surface). |
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what happens to salivary alpha amylase in the stomach?
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In the stomach, salivary α-amylase is inactivated by the low pH.
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does glycogen follow the same metabolic pathway as starch?
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Dietary glycogen has essentially the same structure as starch, and its
digestion proceeds by the same pathway. |
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what is the basic metabolic pathway of protein?
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Begins in the stomach when pepsin digests proteins to form polypeptides --> moves to Small Intestine--> secretin SI --? NaHCO3
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What are endopeptidases?
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in SI endopeptidases (trypsin, chymotrypsin, elastase) cleave peptide bonds in interior of polypeptides
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What are exopeptidases?
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SI exopeptidases (carboxypeptidase, aminopeptidase) cleave peptide bonds from ends of polypeptides
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