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Organ Systems of the Human Body Grade 3 Science A great number of cells make up our body. Tissues refers to a group of cells. Organs and body parts are made up of different types of tissues that come together to form organs or body parts. There are five sensory organs in our body, as well as several additional organs. These organs function together as a team. An organ system is a group of organs that work together to perform one fundamental task for the body. An Organ System is made up of a number of organs that collaborate to perform the same task. In order for our body to operate effectively, these organ systems must work together. Organ Systems  Bones and joints make up the Skeletal System . It supports our bodies and helps us to move about. The skull protects the brain, the rib cage protects the heart and lungs, and the skeleton protects other vital organs. The Digestive System aids in the digestion of meals. The mouth, food pipe, stomach, intestines, and rectum are the organs of