Washington Esthetician State Board Practice Exam

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In addition to the brain, which other organ is primarily composed of nerve tissue?

Heart
Spinal cord
Liver
Lungs

The correct answer is: Spinal cord

The spinal cord is primarily composed of nerve tissue and plays a crucial role in the central nervous system, alongside the brain. It serves as a conduit for signals between the brain and the rest of the body, facilitating reflex actions and transmitting sensory information. The spinal cord is essential for various bodily functions, including motor control and sensory perception. Its structure includes both gray and white matter, where gray matter contains nerve cell bodies, and white matter contains myelinated nerve fibers that enable quick signal transmission. Other organs, such as the heart, liver, and lungs, while vital to the body, are not composed of nerve tissue. The heart consists mainly of cardiac muscle tissue, the liver is made up of hepatocytes and connective tissue, and the lungs comprise respiratory epithelial tissue, which does not have the specialized functions of nerve tissue found in the spinal cord and brain.