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5 Cards in this Set
- Front
- Back
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Mouth role in digestion |
Saliva contains Mucus and water to help during peristalsis Salivary amylase to digest amylose in starch to maltose Epiglottis blocks trachea from the food Tounge helps to form food into bolus |
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Describe peristalsis |
The oesophageal muscles repeated contraction and relaxation |
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Stomachs role in digestion |
Three layers of muscle to churn chyme Gradually released into the duodenum by a sphincter a circular muscles that acts as a valve Gastric pits secrete gastric juices,HCl doesn't actually aid digestion but denatures enzymes to prevent further hydrolysis of amylose |
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Role of duodenum in digest |
Pancreatic juice is secreted by the pancreas which contains carbohydrases, proteases and lipases. Bile secreted by the liver is stored in the fall bladder and release by bile duct Mucus to protect duodenum from damage Bile salts to aid lipid digestion Sodium hydrogen carbonate to neutralise chyme |
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Role of ileum in digestion |
Final site of digestion and absorption Large surface area many levels of villi, microvilli and one layer of epithelial cells so there is a short diffusion distance |
