Our body needs food to provide it with energy, vitamins, and minerals. However, in order use food, we must first break it down into substances that the various organs and cells in our body can use. This is the job of our digestive system.
The digestive system acts in stages to digest our food. Each stage is important and prepares the food for the next stage. The entire length of our digestive system is around 20 to 30 feet!
Here are the major stages of the digestive system:
1. Chewing - Chewing is the first stage of the digestive system. When you chew your food it breaks up big pieces into little pieces that are easier to digest and swallow. Also, your saliva is more than just water. It has special enzymes in it that start to break down starchy food (potatoes, bread) while you chew.
2. Swallowing - Swallowing may seem like a simple process to us. It just sort of happens. But food doesn't just fall down our throats into our stomach. First, our tongue helps to push food into the back of our throat. Then there are special throat muscles that force the food down into a long tube that leads to our stomach, called the esophagus. The food doesn't just fall down the pipe, muscles push the food along until it gets to our stomach. At the same time all this is going on, a flap blocks off our windpipe making sure food doesn't go the wrong way. We call this "going down the wrong pipe" and it can make us choke. This flap is called the epiglottis and, fortunately for us, it works automatically.
3. Stomach - The next stage is the stomach. Food hangs out in the stomach for around four hours. While the food sits there, more enzymes go to work on it, breaking down things like proteins that our bodies can use. The stomach kills a lot of bad bacteria as well, so we don't get sick.
4. Small Intestine - The first part of the small intestine works with juices from the liver and pancreas to continue to break down our food. The second part is where the food gets absorbed from the intestine and into our body through the blood.
5. Large Intestine - The last stage is the large intestine. Any food that the body doesn't need or can't use is sent to the large intestine and later leaves the body as waste.
The Liver and Pancreas
The liver and pancreas do a lot to help the digestive system along. Both work with the small intestine. The liver provides bile (stored in the gall bladder) that helps break up fat into smaller bits. The pancreas provides additional enzymes to help digest all sorts of food. The liver also processes the digested food from your blood before it gets sent to various places in your body to be used.
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Transcript of A Cheese Sandwich's Journey Through the Digestive System
The Digestive System A Cheese Sandwich's
Journey Through the
Digestive System First, the food is placed into the mouth. It is chewed whilst saliva is produced to make the food into a paste. The amylase enzymes turn the starch molecules found in the bread into glucose. This is used by cells to give us energy. Different enzymes are needed for different food categories (e.g. protein, starch). First the molecule joins with the enzyme. The enzyme then breaks it down into products. These are then released into the body. The food enters the throat where muscles push it down into the esophagus which joins the throat and the stomach. The food enters the stomach where hydrochloric acids break the food down further. Protease enzymes break the proteins down into amino acids which help build up and repair muscles and tissue. These are the reason that proteins are so important to us and even more so to athletes.
The second job of the stomach is to churn it all together into a mush . This is stored then finally released into the small intestine. Protease and amylase enzymes again break down the food until the nutrients such as glucose and fatty acids are small enough to pass through the villi from which they enter the bloodstream. The nutrients travel with the oxygen in the blood around the body to each of the cells. The cells produce energy using the oxygen and nutrients. The blood then carries the waste CO2 to the lungs where it is exhaled.
The small intestine finally releases the waste products into the large intestine which is located around the small intestine. The small intestine is made up of three parts; the duodenum (where iron is absorbed), the jejunum (where amino acids and digested carbohydrates are absorbed) and the ileum (where vitamin B12 and bile salts are absorbed). The large intestine extracts the water from whats left and sends the rest (now known as faeces) on to the rectum where it is stored until they are passed on to the anus where the faeces are released. The rectum. Thank you for watching! The cheese sandwich is made up of bread, butter and cheese. The bread is made up of carbohydrates and fiber. The cheese is mainly made up of fat but also contains a little bit of protein as well as some vitamins and calcium. The butter is also mainly fat. A B 1 2 3 4 1 2 3 4 By Matthew Chambers, 7V3.