Theories of tissue development

Theories of tissue development explain how specialized tissues form in the body. One theory, the **morphogen gradient model**, suggests that signals called morphogens create concentration gradients that guide cells to become specific tissue types based on their position. The **epigenetic model** emphasizes that gene activity, influenced by environmental factors and chemical modifications, determines cell specialization. The **cell signaling model** highlights communication between cells through chemical signals, coordinating their development. Overall, these theories combine to describe how cells grow, differentiate, and organize into the complex tissues that make up our body.