What are nerves primarily composed of?

Nerves are primarily composed of axons bundled into cables. This structure allows nerves to effectively transmit electrical signals throughout the body. Axons are long, slender projections of neurons that carry nerve impulses away from the cell body to other neurons, muscles, or glands. When these axons are grouped together, they form a nerve, which serves as a communication pathway within the nervous system.

The other options, while relevant to nervous system function, do not accurately describe the primary composition of nerves. Neurons and dendrites refer to the broader structure of individual nerve cells rather than the bundled form of nerves. Neurotransmitters and synapses are crucial for communication between neurons but are not structural components of nerves themselves. Cell bodies, on the other hand, are essential for the metabolic functions of neurons but do not represent the collective structure of a nerve. Thus, the correct answer highlights the specific composition and functional role of nerves in the nervous system.