The Digestive system
This, too, is a very wonderful system. Many respects it can be likened to a large factory in which product are taken in and worked over to produce finally some refined item or object. Part of the process is a disposal of waste material. The digestive work may be divided up into five main part:
You take into your body, through your mouth, a large variety of food and drink. Food is chewed up in your mouth and swallowed into the stomach.
Soon as you start chewing. Taking into your mouth, little glands in your cheeks and under your tongue squirt fluid into your mouth. This is mixed up with food you are chewing, and starts digesting sugars and starches. Your teeth are given you to help this process by proper crushing and grinding of your food before it is swallowed. When the food reaches the stomach, the acid and fluids of the stomach mix with the food to continue the digestive work. Status and sugars are broken down from very complex foodstuffs to the simplest of sugars, similar to those food and fruits and honey.
When the starches and sugars have been completely digested, the mixture passes from the stomach into the small intestine. Here other glands in intestinal wall, the pancreas and the gallbladder, secrete, or give, their fluids to the intestine, where the fluids mix with the foodstuffs and breakdown with proteins and fat into simple substances. As the food substances continue through the small intestine, this process reaches completion.
During the digestive process, as the food passes through the stomach small intestine, all the valuable substances which have been broken down into simple element by digestion are absorbed through the intestinal wall into the bloodstream. As the food passes through the large intestine, fluid is taken out, and the original solid foodstuff, which was mixed with the digestive juices to form a fluid- like substance, is now dried to semi solid form for passing out of the body in the form of stool.
The simple foodstuffs which have been absorbed, or taken into the blood are now taken to the liver. The liver stores the sugars and proteins that the needs for emergencies, and sends the rest of the foods at a steady rate through the bloodstream to all parts of the body. Thus, although we do not eat continuously the food substances in our blood are maintained throughout the day at a correct level. These food substances are used by the body to provide energy, growth, replacement of old cells and to do other vital work.
The foodstuffs which were not absorbed through the intestinal walls are passed on to the large intestine and eliminated at regular intervals. It may be well to note that for this function to be normal, adequate supplies of roughage should be taken into the body (brown bread instead of white fruit with the skins on instead of being peeled, and plenty of vegetables and fruit). One can see that his digestive system works to take the best out of everything that he eats, and to throw away the things that are of no value.