Digestive System Research Paper

The digestive organs of the lower torso include lower gastrointestinal (GI) tract, which consists of the small intestine, large intestine, and anus. Several accessory organs, such as the liver and pancreas, assist the lower GI tract with the digestion of food to release nutrients. The food is digested completely and at this time all of the nutrients have been absorbed into the bloodstream. Bacteria also assist the digestion of food and its converting into feces for defaction. There is an acidic fluid that passes from the stomach through the small intestine, consisting of gastric juices and partly digested food called Chyme.
This acidic, Chyme reaches the lower GI tract through the pyloric sphincter of the stomach. Chyme passes through the pyloric sphincter and enters the duodenum. The duodenum is apart of the small intestine and is located inferior to the right of the stomach. Absorptions of nutrients also takes place in the walls of the duodenum. The jejunum is located in the middle part of the small intestine and is also located …show more content…
The rectum is lined with sensory receptors that monitor pressure and stretching of the rectum. When the rectum become full with feces, these receptors transmits signals to the brain to let the body know that it is ready for defecation. The anal canal is last of the large intestine and it ends at the anus and controls the defecation process. When feces entering the rectum and anal canal, pressure is applied on the internal anal sphincter, causing the smooth muscle tissue to relax and open and be able to defecate. The muscles of the external anal area holds the feces in the anal canal until voluntary signals from the brain trigger its process. Once both sphincters are opened the muscle contracts in the rectum and sigmoid colon push the feces through the anal canal and out of the