Which parts of the body are composed of nervous tissue?

Nervous tissue is specifically responsible for the transmission of nerve impulses and processing information in the body. The primary components of nervous tissue include neurons, which are the cells that send and receive signals, and glial cells, which support and protect neurons.

The correct answer identifies the nerves, spinal cord, and brain as parts of the body composed of nervous tissue. The nerves carry signals throughout the body, the spinal cord serves as a major conduit for information traveling between the brain and the rest of the body, and the brain processes sensory information and coordinates responses. Together, they form the central and peripheral nervous systems, crucial for all bodily functions related to signaling and processing.

In contrast, muscles and tendons consist primarily of muscle tissue, which is structured for contraction and movement. Skin and hair are made up of epithelial tissues and connective tissues, serving roles in protection and sensation rather than signal transmission. Blood vessels and lymph nodes are parts of the circulatory and immune systems, respectively, and mostly consist of connective tissues rather than nervous tissue. Therefore, focusing on the functions and structures unique to nervous tissue clarifies why the correct answer highlights the nerves, spinal cord, and brain.