What characteristic distinguishes nervous tissue from other types of tissue?

Nervous tissue is primarily characterized by the presence of neurons, which are specialized cells responsible for transmitting electrical signals throughout the body. Neurons play a critical role in the communication between different parts of the body, processing sensory information, and coordinating responses. They have unique structures, including dendrites and axons, that enable them to receive and send signals effectively.

While high cellular density is a feature of several tissue types, and certain tissues, like muscle, are known for their ability to contract, these are not exclusive to nervous tissue. Similarly, protective barriers are typical of epithelial tissue rather than nervous tissue. Therefore, the defining feature of nervous tissue that sets it apart is indeed the presence of neurons, making it essential for the functioning of the nervous system.