For example, a group of people compose a corporation that carries out a specific type of function. In the same way, a tissue basically is an organization of cells that carry out a specific type of function. Now, in the human body we have four different types of tissues. So we have four different types of ways in which our cells can organize themselves into these groups known as tissues. We have epithelial tissue, muscle tissue, connective tissue as well as nervous tissue. Now, let's begin by generalizing each one of our tissues.