dig .pdf - Nutrition Digestion Ch 21 Outline • Human...

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Nutrition & Digestion Ch. 21
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Outline Human digestive system Alimentary canal Accessory organs Nutrition Energy & nutrients Weight & disease
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Organ Systems Figure 20.10, p. 424
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Organ Systems Figure 20.10, p. 425
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Food Processing Ingestion eating Digestion mechanical or chemical breakdown of food Absorption nutrients brought into bloodstream Elimination undigested material exits body Fig. 21.2A, pg. 435
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Chemical Digestion Specific enzymes break polymers down into monomers Carbohydrates monosaccharides Digestion begins in mouth ( salivary amylase ); ends in the small intestine ( pancreatic amylase ; maltase, sucrase, lactase, etc) Protein amino acids Digestion starts in stomach ( pepsin ); ends in small intestine (trypsin, chymotrypsin, peptidases) Nucleic acids nucleotides Digestion: small intestine ( nucleases , other enzymes) Fat glycerol & fatty acids Digestion: small intestine ( bile salts , lipase) Fig. 21.2B, pg. 435
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Human Digestive System Alimentary Canal Digestive tube from mouth to anus Accessory organs Secrete digestive fluids Sphincters Muscular rings that regulate passage of food Fig. 21.4, pg. 437
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Oral Cavity Chewing mechanical digestion Salivary glands secrete saliva Lubrication for food pH buffer to neutralize acidic foods Amylase
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