Human: What are the three types of cells that make up the human body? Assistant: 
The three main types of cells in the human body are epithelial, muscle, and connective tissue cells. Epithelial cells line the surfaces of organs and tissues and help protect them from damage. Muscle cells contract to move the body parts they are attached to, such as muscles, tendons, and bones. Connective tissue cells provide support for other cells and tissues within the body.