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The Journey Of A Cheese Sandwich
Transcript of The Journey Of A Cheese Sandwich
☺ By Adolfo López Herrera ☺
The oesophagus links the mouth and the stomach together, so the particles of the cheese sandwich enter the stomach organ next, where the food mixes with enzyme which digests protein.
What Are All This Things For?
"The carbohydrates which were digested in the mouth were used for energy.
There is high of starch content in the bread of the cheese sandwich. Protein,
on the other hand which will be found in cheese is used for building cells.
Proteins are vital for growth and to repair damaged areas of the human body. Hydrochloric acid is present in the stomach to kill bacteria. It has a low pH,
and the enzymes produced by the stomach work best in acidic conditions.
Finally: Egestion (Is Water PArt Of The Digestion Of a Cheese Sandwich?)
Here the water is absorbed so it is not wasted and passed out with the faeces. Water plays a major part in digestion as 75% of our body is made up of water. The rectum stores the waste products and non-digestible food and completes the re-absorption of water. Finally, when convenient, the waste faeces are passed out of the body through the anus. This is called egestion.
The cheese sandwich's journey begins when it is taken into the mouth:
Large particles are broken down into much smaller particles, by chewing, which also mixes the food with saliva which contains a enzyme.
This amylase digests the starch in the sandwich to glucose. The saliva is produced in the three salaivary glands. These are called, parotid, sublingual and submandibular.
When the sandwich is swallowed, the food reaches the gullet.
The food empties from the stomach into the duodenum where it is mixed with enzymes and salts produced by the liver and enzymes made in the pancreas. The pancreas secretes three main enzyme types: protease enzymes, carbohydrase enzymes and enzymes run into the duodenum at the top the small intestine, where it continues its journey. The fats in the sandwich are also used for energy. Bile is also alkaline to give the correct pH for the enzymes in the small intestine. The small intestine produces more enzymes to further digest proteins, fats and carbohydrates.
Pancreas, Intestine ...
Around the oesophagus and throughout the small intestine (duodenum and the 20ft long ileum) are circular muscles which press the sandwich particles along in a contacting and wave motion, so the food gets pressed along. This contracting and relaxing motion is called peristalsis. They become stronger by fibre going down and because fibre is difficult to digest the muscles have to press hard. they become stronger when they are worked on.
In The Intestine
In the small intestine are millions of villi. These are small, but visible to the human eye, which line the small intestine and are perfect for absorbing the food. The main reason why villi are so good at absorbing food is that they have a thin layer of outer cells, which act as a cell, called micro-villi. Whilst villi are structures, micro-villi are tiny cells outside the villi. In the small intestine the food is absorbed through the gut wall into the blood, which takes it around the body to wherever the particles are needed. The job of the enzymes in the small intestine is also to break down the foods.
This is the intestine
Chemical digestion, under the control of enzymes throughout the digestive system, takes up to twenty four hours to complete, depending on what the is being digested.
Mechanical digestion happens quickly but is less thorough at breaking down food. Only particles which have been chemically digested are able to pass through into the blood through the cell wall.
Mechanical digestion on the other hand is done mostly in the mouth (where the teeth are biting down the cheese sandwich into much smaller pieces), but also in the stomach which churns food through muscular action.