The main function of nervous tissue is C. To send signals to control the body. Nervous tissue is made up of specialized cells called neurons that are capable of transmitting electrical and chemical signals throughout the body. These signals allow the nervous system to control and coordinate various body functions, including movement, sensation, and thought processes. In addition to neurons, nervous tissue also contains support cells called glial cells that help to protect and nourish the neurons. Overall, nervous tissue plays a critical role in the functioning of the nervous system and the control of bodily functions.