The digestive system plays a very important role in our bodies. The digestive tract is approximately 9 metres in length. The system is made up of different tubes, pipes and organs. Without out the digestive system we wouldn\’t be able to eat our favourite food such as chocolate, ice cream, strawberries and so on. The food we eat supplies us with energy and helps our body grow, develop and repair itself. Our digestive converts the food that we eat into their simplest form like, glucose (sugars), amino acids (make up protein),vitamins,minerals,fatty acids and other important substances. The digestive system carries the nutrients through our bodies that keeps our cells functioning, the cells take the amino acids carbohydrates etc. and travels it around the body through the blood stream. The nutrients is absorbed by the cardiovascular and lymphatic system. Just by eating we help our bodies grow we need a mix of glucose, amino acids, vitamins,minerals and fatty acids and our digestive system absorbs all of these. But what are they? Glucose is the main source of energy to fuel our bodies, by giving energy to our cells
Amino acids help build cells and repair tissues, They create antibodies to fight of viruses and bacteria. Amino acids carry oxygen around the body. Most amino acids can be made from our bodies, however we need amino acids from our food as well. Digestion begins at the mouth. We break down the food by chewing it continuously, with the help of our saliva. Saliva contains and enzyme which breaking down the carbohyrdates and sugars. Once we swallow our food, the esophagus pushes the food to our stomachs. The food passes through a sphincter ( small muscle ring ) and then our stomach. In our stomachs there are plenty of gastric juices that break down the food further. Our stomachs break down the food further and kill bacteria as the stomach contains lots of acids that kill it. After it is all broken down the stomach turns the food into a cream the stomach stores it until its ready to pass it through to the small intestine. Digestion also separates the unneeded materials that is left after all the water and nutrients have been absorbed by the small and large intestine. begins at the mouth and finishes at the anus where waste is disposed of.
The small intestine absorbs about 90 percent of the nutrients and water while the large intestine gets what ever is left and disposes of indigestible food through the anus. Why is digestion important? Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body. The body breaks down nutrients from food and drink into carbohydrates, protein, fats, and vitamins. CARBOHYDRATES Carbohydrates are the sugars, starches, and fiber found in many foods. Carbohydrates are called simple or complex, depending on their chemical structure. Simple carbohydrates include sugars found naturally in foods such as fruits, vegetables, milk, and milk products, as well as sugars added during food processing. Complex carbohydrates are starches and fiber found in whole-grain breads and cereals, starchy vegetables, and legumes.
PROTEIN Foods such as meat, eggs, and beans consist of large molecules of protein that the body digests into smaller molecules called amino acids. The body absorbs amino acids through the small intestine into the blood, which then carries them throughout the body. FATS Fat molecules are a rich source of energy for the body and help the body absorb vitamins. Oils, such as corn, canola, olive, safflower, soybean, and sunflower, are examples of healthy fats. Butter, shortening, and snack foods are examples of less healthy fats. During digestion, the body breaks down fat molecules into fatty acids and glycerol. VITAMINS Scientists classify vitamins by the fluid in which they dissolve. Water-soluble vitamins include all the B vitamins and vitamin C. Fat-soluble vitamins include vitamins A, D, E, and K. Each vitamin has a different role in the bodyвs growth and health. The body stores fat-soluble vitamins in the liver and fatty tissues, whereas the body does not easily store water-soluble vitamins and flushes out the extra in the urine.