We learned about some parts of the circulatory system such as the heart, vessels, and blood. We learned about the digestive system. We explored the functions of the esophagus, stomach, small intestine, and large intestine. We learned that the function of the liver is to make a juice called bile that helps break down large blobs of fat into tiny droplets so that the fats can be broken down more easily. Then we learned that the pancreas makes juices that are released into the small intestine. These juices break down fats and proteins into small pieces that can be absorbed. Next we learned the gallbladder stores bile from the liver and sends it to the small intestine only when food passes through.Waste Removal - We learned that the excretory system rids the body of waste and keeps the water and salt levels in balance. Then we learned when protein is broken down ammonia is made which the liver converts to urea. Next we learned that like a fire our body uses oxygen and produces carbon dioxide which is released by our lungs. Finally we learned the sequence of the urinary system: kidneys remove waste from blood, ureters take urine to the bladder for storage, and the urethra which takes the urine outside the body.