In class, we worked on a lab which taught us how our stomach worked. We labeled four different tubes from A-D on day one. We put pepsin, a meat tenderizer, and hydrochloric acid in the test tubes. On day two, we observed the test tubes to see the changes that happened over-night. We took a straw and poked each test tube with it and then swiped the straw on litmus to see what color the paper turned. For test tubes for two of the four test tubes, nothing changed. For the other two test tubes the products in the test tubes changed the litmus to a pink color. This is because these were the test tubes that had hydrochloric acid in them. This lab shows how our stomach works. The digestive system is very slow. It is able to break down food we eat with enzymes and acids. This is what we have been learning for the past two days in the lab.
