Final answer:
Nervous tissue is composed of neurons and glial cells. Neurons are responsible for computation and communication in the nervous system. Gray matter contains cell bodies and dendrites, while white matter consists of axons and appears white due to myelin.
Step-by-step explanation:
Nervous tissue is composed of two types of cells: neurons and glial cells. Neurons are responsible for the computation and communication in the nervous system, while glial cells provide support to neurons. Neurons have a cell body (soma), dendrites for receiving input, and an axon for sending signals to target cells.
The nervous tissue has regions called gray matter (with many cell bodies and dendrites) and white matter (with many axons). Gray matter may have different colors due to blood content, while white matter appears white due to the presence of myelin, a lipid-rich substance.