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Access Prior Knowledge 1. What happens in the air sacs and the capillaries that surround them? 2. Name the parts of the respiratory system. Review previous outlines and write one question to ask classmates. Digestive System The digestive system breaks down the food into very small materials so that the food can enter your cells. Your digestive system is made up of many organs that work together to help digest food. Mouth and Esophagus The first step in digestion is chewing the food which is done with your teeth. Saliva also helps breaking down food in your mouth by using chemicals in the liquid. When you swallow the food it enters your esophagus and the muscles there push and squeeze the food into the stomach through this tube. Stomach and Intestines Walls of the stomach can stretch to store food and the stomach produces fluids that help in digestion. The stomach squeezes the food into the small intestines where it receives chemicals from the two organs, the pancreas and liver, which help in digestion. The walls of the small intestine are lined with structures called villi, which are shaped like fingers to provide more surface area to absorb food. When digestion is finished, the particles of digested food move into the blood vessels in the small intestines. The food that is not digested moves into the large intestine where it takes water and salts from the waste to make it solid. Urinary System The urinary system removes waste from your blood through two organs called the kidneys. The kidneys clean the blood, regulate the level of salt in the blood and control the level of water in the blood. The urinary bladder stores a mix of wastes and water (urine), until it is ready to leave the body. TextQuest 1. What is the job of the digestive system? 2. List two functions your teeth do in the first part of the digestive process. 3. Name the structure of the small intestine that shaped to provide more surface area to absorb food. 4. How do the kidneys regulate the amount of water in the blood? 5. Where do the mixture of water and waste get stored before leaving your body?