The digestive system is the system where food is broken down and turned into nutrients. The parts are the mouth, esophagus, stomach, liver, gallbladder, pancreas, small intestine, large intestine, rectum and anus. Each part has a different task to do. In this presentation we will cover all of them. The mouth is where the process starts. You put the food in your mouth and you start gnashing the food with your teeth. While you are doing that your saliva is breaking down and softening the food. The saliva comes from the salivary glands. Saliva is 98% water but contains many important substances including electrodes, mucus, antibacterial compounds and various enzymes. After your food is chewed up it moves to your esophagus. After the mouth, the esophagus comes in. The esophagus connects the stomach and the throat. The esophagus is about 8 inches long and is lined by a moist pink tissue called mucous. The esophagus runs behind the windpipe or trachea and heart but is in front of the spine. Just before entering the stomach the esophagus passes through the organ called the diaphragm. The upper esophageal sphincter is a bunch of muscles ( under conscious control) at the top of the esophagus that help with breathing, eating, belching, and vomiting. They keep food and secretions from going down the windpipe. The lower esophageal sphincter is an bundle of muscles ( under involuntary control) at the low end of the esophagus, where it meets the stomach. When it is closed it prevents acid and stomach contents from traveling backwards from the stomach. The stomach is an organ which the food is broken down after coming down the esophagus through the valve called the esophageal sphincter. Inside the stomach the food is digested by acid and enzymes which are secreted by the stomach. The stomach is lined with with ridges of muscle tissue that are called rugger.