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Mechanisms of Digestion

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Introduction

Digestion In this unit I will learn about different groups of food, how important they are to us to fuel us with energy and help growth and repair. Also I will look at how food is digested and how to keep a balanced diet. Digestion- an Introduction Digestion is the breaking down of foods we eat, usually too large to enter the bloodstream. It helps extract nutrients from foods. It also helps extract Carbohydrates, Vitamins, Salts, Fats, Proteins and Fibres from the foods to help give us energy and aid growth and repair. All of these food groups must be eaten, in balanced amounts. Too much, or too little of one of these food groups can cause us great damage. The food groups we must eat the most of are Carbohydrates and Vitamins, Vitamins usually taken from fruits vegetables such as carrots, oranges and cucumbers and Carbohydrates from starches such as bread, potatoes and pasta. Proteins and fibres are very significant too, and fat is also. If too much fat is taken though, which is very common today as much food contains huge amounts of fats, it can result in obesity. ...read more.

Middle

It is kept in the intestines to help move around the digested food and other materials. So how does food enter the digestive system? The answer is the moment you swallow your food. The mouth is the first step on the long journey of the food. Once the food has entered the mouth it is chewed up and broken down using saliva, which contains an enzyme called Amylase. After it is soft and small enough it is swallowed. After being swallowed the food is pushed down the oesophagus, a long tube running from the mouth to the stomach, the food is transported to the stomach via the oesophagus. Once into the stomach the digestive juices begin to break the food down more, sugar is transported into the bloodstream here so that is the reason sugary foods give a quick burst of energy because the sugars are digested so early, then moving into the small intestine where the nutrients are extracted from the food. Then the remainder of the food, made up of water and fibre is moved into the large intestine. In the large intestine the water and fibre is pushed along to the rectum. ...read more.

Conclusion

also help maintain cells; Fats help keep the body insulated and warm, as well as being used to help protect organs, muscles and bones, Fats also contain what is needed to create cell membranes, again it provides some energy, although most of the energy we use comes from Carbohydrates. Fibre is slightly different from most other nutrients, it is not actually digested. It is kept in the intestines to help move around the digested food and other materials. Also water is found in many foods and drinks, it helps hydrate the body and produce body fluids as well as maintaining cells. Carbohydrates, Fats, Vitamins, Salts, Proteins and Fibres come in many different foods, below are some examples of what nutrients are in which foods: * Rice- Contains mostly Carbohydrates and very little Water or Protein. * Chocolate- Contains mostly Carbohydrates, a small amount of protein and very little water. * Cucumber- Contains mostly Water (90% of it is water), very little protein and no Carbohydrates. * Soya Beans- Contains mostly Protein, a small amount of Carbohydrate and very little water. So many different foods contain different nutrients. Nutrients are what we require to keep us alive, without food we would be able to get no nutrients and wouldn't be able to live. ...read more.

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