Body Systems Digestive-Circulatory-Respiratory-Reproductive Digestive System • The digestive system is used for breaking down food into nutrients which then pass into the circulatory system and are taken to where they are needed in the body. 1. Mouth • When food enters the mouth it starts the breakdown process • Physically being broken down by the teeth. • Chemically being broken down by amylase 2. Epiglottis to Esophagus • Food is formed into a bolus and then swallowed. • The epiglottis chooses the pathway to trachea or esophagus. 3. Stomach • The stomach has folds called rugae which expand and contract with gastric juices(made by the stomach) to digest food(stomach acid, mucus and enzymes). • Proteins are broken down in the stomach. 4. Small Intestines • In the small intestine, bile (produced in the liver and stored in the gall bladder), pancreatic enzymes, and other digestive enzymes produced by the inner wall of the small intestine help in the breakdown of food. • 5m long Small Intestine Help • Pancreas- enzymes to break down the carbohydrate, fat, and protein in food. • The Liver produces yet another digestive juice— bile. The bile is stored between meals in the gallbladder. Bile helps digest fats. 5. Large Intestine • In the large intestine, some of the water and electrolytes • 5 ft 6. Anus • Solid waste is then stored in the rectum until it is excreted via the anus. Circulatory system • Blood cells are produced in the spine, ribs, and pelvis Receiving O2 Filters • Kidneys. The kidneys are two bean-shaped organs, each about the size of a fist. They are located just below the rib cage, one on each side of the spine. Every day, the kidneys filter about 120 to 150 quarts of blood to produce about 1 to 2 quarts of urine. The kidneys work around the clock; a person does not control what they do. • Ureters • Bladder • Urinary tract Filter • The spleen acts as a filter for blood as part of the immune system. Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen also helps fight certain kinds of bacteria that cause pneumonia and meningitis. Filters • The liver monitors the contents of blood and remove many potentially toxic substances before they can reach the rest of the body.