Carbohydrate Digestion Flashcards

1
Q

Sites of Carbohydrate Digestion

A

Mouth and small intestine

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2
Q

Carbohydrate Dietary Sources

A

Starch, lactose, sucrose, trehalose, cellulose

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3
Q

2 Types of Digestion in Mouth

A

Mechanical (chewing) and Chemical (salivary amylase)

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4
Q

Salivary Amylase Action

A

Starch hydrolysed to maltose and dextrin. PH = 6.8- 7. Breaks down 5% of starch digestion

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5
Q

Pancreatic Enzymes for Carbohydrates

A

Alpha - amylase

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6
Q

Brush Border Enzymes for Carbohydrates

A

Disaccharidases, oligosaccharides, isomaltase and alpha (1,6) glucosidase

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7
Q

Alpha amylase

A

Endoglycosidase (attacks glycosidic bonds between internal C’s). Specific to 1,4 linkages (not 1, 6). Hydrolytic products: maltose, maltotirose and alpha limit dextrins

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8
Q

Maltase substrate and product

A

Substrate: maltose and maltotirose. Product: 2 glucose molecules

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9
Q

Sucrase substrate and products

A

Substrate: Sucrose. Product: glucose and fructose

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10
Q

Lactase substrate and product

A

Substrate: lactose. Products: glucose and galactose

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11
Q

Trehalase substrate and product

A

Substrate: Trehalsose. Products: 2 glucose molecules

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12
Q

Alpha amylase substrate

A

Polysaccarides

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13
Q

Disaccharidases Substrate

A

Disaccharides

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14
Q

Isomaltase Substrate

A

Branch points of oligosaccharides and dissacharides

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15
Q

Alpha (1,6) glucosidase

A

Branch points of oligosaccharides and dissacharides

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16
Q

Absorption into eneterocytes

A

Passive diffusion (very slow). Membrane associated transporters Na+ independent transporter (glut5, primary active) and Na+ co transporter transporter (SGGLUT1, secondary active)

17
Q

Glut 1 Transporter Outline

A

Facilitated diffusion of glucose in and out of cell

18
Q

Glut 2 Transporter Outline

A

Facilitated Diffusion. Glucose, galactose and fructose out of cell

19
Q

Glut 5 transporter outline

A

Fructose into cell by facilitated diffusion

20
Q

SGLT1 Transporter Outline

A

Active transport Na, glucose and galactose