digestive system

Digestive System Digestive system includes the stomach, liver, pancreas, duodenum, ileum and colon. What is a Digestive system? Digestion is a breakdown and transportation of the solid and liquid food into microscopic substances therefore theses substances are then transported into different areas of the body The digestive system is a set of organs which transforms whatever we eat into substances that can be used in the body for energy, growth and repair. Once the food has been broken down by the various chemical processes, and nutrients removed, the rest is excreted as waste. The whole process involves many different organs and sometimes takes several hours. There are four stages of digestion:-  Mouth: ingestion (taking in of food or liquid into the body), chewing and swallowing this is the starch of digestion.  Stomach: mixing and protein digestion  Small Intestines: carbohydrates and fat digestion abortion  Large intestine: waste and excretion Reference: http://en.wikipedia.org/wiki/Digestive_system Website viewed on 28 / 5 / 08

Reference: http://training.seer.cancer.gov/module_anatomy/unit10_3_dige_regions.html Class notes hand out 26 / 2 / 2008
Web sight viewed on 27 / 2 2008 Where Does Digestion Start? The digestion starts within the mouth where the action of the teeth and saliva combined in the first stage of breakdown which is chewing and partially digesting the food so that it can pass threw more easily along the oesophagus therefore the ball of the food that leaves the mouth is known as bolus. Saliva  The salvia is a liquid secreted by three pairs of  The parotid gland placed below the ear  The submandibular gland and the sublingual gland both of these are placed below the tongue.  It contains water, mucus and enzyme salivary amylase. The Three Functions of the Saliva  To lubricate the food