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BC1502 Introduction to Cell and Molecular Biology
Macromolecules
Nutrition & biochemistryLecture 5b
James A Martiney, Ph.D.
Enzymatic Digestion of Nutrients
Figure 47-9 p1053
Absorption and digestion of disaccharides and small peptides
Figure 47-14 p1057
Polysaccharides and disaccharides
DisaccharidasesBrush-border cells of
intestinal mucosa Amino acidsMonosaccharides
To extracellular fluid and blood
Small peptides
Lumenof small
intestine
Aminopeptidases
Figure 47-15 p1058
Brush-border cells of
intestinal mucosa
Lumenof small
intestine
Interstitialfluid
Endoplasmicreticulum Monoglycerides
Triglycerides
Chylomicrons
Chylomicrons exit the cell byexocytosis and enter lymph vessels.
Chylomicron
Fatty acids
Micelles
Bile salts
Monoglycerides Fatty acids
Absorption of fat-soluble products of digestionby intestinal mucosa cells
Lipoproteincoat
Aggregatedtriglycerides Aggregate and coated
with lipoprotein
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