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Transcript of Digestion System
9. Large Intestine
11.Anus Small Intestine Large Intestine The large intestine absorbs water and some vitamins produced by bacteria. It also prepares waste for elimination from the body through the anus. Long sausage like cord connected to the large intestine that helps with chemical digestion and absorption of food through the projections villi, that are covered with a microvilli. Nutrients enter as broken down molecules through the villi and enter the bloodstream. This is done by enzymes breaking down larger molecules too big to enter the bloodstream have to be broken down. For example: glucose into starch, protein into amino acids. these new chemicals then flow into the bloodstream. Pancreas The pancreas is a glandular organ in the digestive system. Its enzymes help to further break down the carbohydrates, proteins, and lipids in the small chime. The conversion of foodstuff to energy and various body processes produces excess compounds that cannot be used by the body. They must be removed or else the body will become toxic. The process of excretion involves finding and removing waste materials produced by the body. Rectum The rectum acts as a temporary storage site for feces. The rectum is the final portion of the large intestine in some mammals, and the gut in others. When the rectum becomes full, the increase in intrarectal pressure forces the walls of the anal canal apart, allowing the fecal matter to enter the canal. The rectum shortens as material is forced into the anal canal and peristaltic waves propel the feces out of the rectum. The internal and external sphincter allow the feces to be passed by muscles pulling the anus up over the exiting feces. The feces are eliminated through the anus. Mouth The mouth is the first step of digestion. It is where the process of chewing and mechanical digestion starts to break down food and enzymes such as salivary lipase and amylase also start to chemically break down the food. Salivary Glands Produces saliva that keeps the mouth moist and ready for digestion Tongue Food starts to be digested by the saliva in chemical digestion Esophagus Carries the food down to the stomach Stomach Mixes and churns the food for further digestion Liver Converges potentially dangerous nitrogen gas into less toxic urea Small Intestine Helps chemical digestion and absorption of food through villi Large Intestine The large intestine absorbs water and some vitamins produced by bacteria. It also prepares for elimination from the body through the anus Helps further break down the carbohydrates, proteins, and lipids Pancreas Rectum Food is stored and then exited through the rectum as feces Gallbladder Releases bile into the small intestine when fat is present in the duodenum.