Bioman lecti
3
7/30/2019 Bioman lecti http://slidepdf.com/reader/full/bioman-lecti 1/3 1 Lecture 67 The Digestive System § Functions of the small intestine § Chemical digestion § Nutrient absorption § Several substances enter the SI § Chyme from the stomach § Digestive enzymes from the: § Liver § Gallbladder § Pancreas The Digestive System – The Small Intestine § Chemical Digestion in the small intestine § Many enzymes are secreted into the small intestine and break down nutrients: § Carbohydrates è Monosaccharides § Proteins è Amino Acids § Lipids è Monoglycerides and Fatty Acids The Digestive System – The Small Intestine § The Pancreas, Liver and Gallbladder assist chemical digestion in the SI. § The Pancreas secretes enzymes that break down carbohydrates, lipids, and proteins. § The Liver manufactures bile, and stores it in the gallbladder until needed. § Bile aids lipid digestion by emulsifying lipids (it suspends them in water). The Digestive System – The Small Intestine *Chart in Textbook* *Small intestine is making enzymes that assist in the breaking down of carbs
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Transcript of Bioman lecti
7/30/2019 Bioman lecti
http://slidepdf.com/reader/full/bioman-lecti 1/3
1
Lecture 67
The Digestive System
§ Functions of the small intestine
§ Chemical digestion
§ Nutrient absorption
§ Several substances enter the SI§ Chyme from the stomach
§ Digestive enzymes from the:
§ Liver
§ Gallbladder
§ Pancreas
The Digestive System – The Small Intestine
§ Chemical Digestion in the small intestine
§ Many enzymes are secreted into the small
intestine and break down nutrients:
§ Carbohydrates è Monosaccharides
§ Proteins è Amino Acids
§ Lipids è Monoglycerides and Fatty Acids
The Digestive System – The Small Intestine
§ The Pancreas, Liver and Gallbladder
assist chemical digestion in the SI.
§ The Pancreas secretes enzymes that break
down carbohydrates, lipids, and proteins.
§ The Liver manufactures bile, and stores it inthe gallbladder until needed.
§ Bile aids lipid digestion by emulsifying lipids
(it suspends them in water).
The Digestive System – The Small Intestine
*Chart in Textbook*
*Small intestine is making enzymes thatassist in the breaking down of carbs
7/30/2019 Bioman lecti
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2
The Digestive System – The Small Intestine
Liver
Gallbladder
Pancreas
Stomach
SmallIntestine
§ Nutrient absorption in the small intestine
§ The small intestine is covered by villi.
§ The villi are covered by microvilli.
§ Digested nutrients pass across the microvilli
and enter the blood.
The Digestive System – The Small Intestine
Small Intestine Villi Microvilli
Disaccharide
Monosaccharide
Polysaccharide
Glucose
Fructose
Carbohydrate Digestion and Absorption
Protein
Peptide Aminoacids
Protein Digestion and Absorption
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