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Steve orders a burger for dinner. He takes his first bite of the burger and it begins to go through the digestion system.
The burger starts the digestion in the mouth. The teeth break down the burger into smaller pieces. The saliva in the mouth then moistens the pieces which makes it easier for it to be swallowed. The saliva contains amylase which starts to convert the carbohydrates into simple sugars.
The pieces of the burger moves down the esophagus and towards the stomach where it is further digested.
The burger goes into the stomach where it is further digested using chemical digestion. The cheese is broken down for protein in the stomach. The glands in the stomach produce acid and an enzyme that digests the protein. The vitamins from the lettuce and tomato go undigested until they reach the small intestine.
The fat goes undigested and unrecognized throughout the stomach until it reaches the small intestine. The fats are broken down further after being broken down in the mouth. Having the fats in smaller components makes it easier for the enzyme to digest and process it. Lipase breaks down the fat into fatty acids which are then used in the small intestine. The vitamins from the lettuce and tomato are absorbed into the small intestine. Carbohydrates are absorbed into the small intestine. The pancreatic amylase breaks down the carbohydrates into oligosaccharides.
Once all of the nutrients has been absorbed the remaining waste (feces) is released through the anus.
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