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| **''Glycogen'' is synthesised in the liver and muscle and is similar to amylopectin as it has both α1-4 glycosidic links and α1-6 glycosidic links. However it is more highly branched with shorter branches (branches every 12-18 glucose residues). | | **''Glycogen'' is synthesised in the liver and muscle and is similar to amylopectin as it has both α1-4 glycosidic links and α1-6 glycosidic links. However it is more highly branched with shorter branches (branches every 12-18 glucose residues). |
| *The '''first stage''' of carbohydrate digestion begins with α-amylase, which is an endoglycosidase. ''(This means it breaks bonds in the middle of the polymer to produce di-, tri- and oligo-saccarides).'' | | *The '''first stage''' of carbohydrate digestion begins with α-amylase, which is an endoglycosidase. ''(This means it breaks bonds in the middle of the polymer to produce di-, tri- and oligo-saccarides).'' |
− | *α-Amylase is present in [[Oral Cavity - Salivary Glands - Anatomy & Physiology|saliva]]. Salivary α-amylase is inactivated when it enters the stomach due to it's acidic pH. | + | *α-Amylase is present in [[Oral Cavity - Salivary Glands - Anatomy & Physiology|saliva]]. Salivary α-amylase is inactivated when it enters the [[Forestomach - Anatomy & Physiology|stomach]] due to it's acidic pH. |
| *Carbohydrate digestion continues in the lumen of the [[Small Intestine - Anatomy & Physiology|small intestine]] as pancreatic α-amylase enters the [[Duodenum - Anatomy & Physiology|duodenum]] in the pancreatic duct. This is the site of the majority of carbohydrate digestion. | | *Carbohydrate digestion continues in the lumen of the [[Small Intestine - Anatomy & Physiology|small intestine]] as pancreatic α-amylase enters the [[Duodenum - Anatomy & Physiology|duodenum]] in the pancreatic duct. This is the site of the majority of carbohydrate digestion. |
| *The '''second stage''' is the digestion of di-, tri-, and oligo-saccharides to monosaccharides. | | *The '''second stage''' is the digestion of di-, tri-, and oligo-saccharides to monosaccharides. |
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| **The energy release is used to transport glucose and galactose up their concentration gradients into the enterocyte. | | **The energy release is used to transport glucose and galactose up their concentration gradients into the enterocyte. |
| **Glucose and galactose can then diffuse into the blood (portal vein) by carrier mediated diffusion via a GLUT-5 transporter. | | **Glucose and galactose can then diffuse into the blood (portal vein) by carrier mediated diffusion via a GLUT-5 transporter. |
| + | |
| ====Triacylglycerol Digestion and Absorption==== | | ====Triacylglycerol Digestion and Absorption==== |
| *Triacylglycerols (TAGs) are digested by lipases. | | *Triacylglycerols (TAGs) are digested by lipases. |