PSI Barbering Practice Exam

Nerve tissue is composed of special cells known as what?

1. Neuroglia

2. Neurons

3. Astrocytes

4. Axons

The correct answer is: Neurons

Nerve tissue is primarily made up of neurons, which are specialized cells responsible for transmitting nerve impulses throughout the body. Neurons are vital for processing and communicating information within the nervous system, allowing for a wide range of functions such as movement, sensation, and reflexes. Each neuron consists of a cell body, dendrites, and an axon, allowing it to receive signals from other neurons and transmit electrical impulses to target cells. While neuroglia, astrocytes, and axons play important roles within the nervous system, they do not represent the primary cell type that constitutes nerve tissue. Neuroglia, for instance, are supportive cells that provide protection, nourishment, and insulation to neurons but do not conduct electrical impulses themselves. Astrocytes, a type of neuroglia, specifically contribute to maintaining the blood-brain barrier, regulating blood flow, and supporting neuronal health. Axons are the long extensions of neurons that transmit impulses, but they are parts of neurons rather than independent cell types. Understanding the structure and function of neurons is crucial for comprehending how the nervous system operates, highlighting the importance of distinguishing neurons as the key composing cells of nerve tissue.