A group of cells working together to do a job is called tissue. There are several different types of tissue found in the human body, all of which perform different functions.
The four different types of tissue are epithelium, nerve, muscle and connective tissues. Epithelial tissues are those that cover the body and line the inner organs. Connective tissue holds all moving parts together with the right spatial configurations. Muscle tissue works to exert force and provides strength, while nerve tissue allows for the electrical messages to be transported through the body. Cells working together to make tissues, and tissues work together to make up the body, allowing the body to function properly.