What is the name of the long chain section of a nerve cell?

The long chain section of a nerve cell is known as the axon. This part of the neuron is essential for transmitting electrical impulses away from the cell body and towards other neurons, muscles, or glands. The axon is typically elongated and can vary in length, sometimes extending several feet in larger organisms. Its primary function is to conduct action potentials—rapid electrical signals that allow communication between nerve cells.

In contrast, the other structures listed have different roles within the nervous system. The nucleus is the control center of the cell, containing genetic material and regulating cell function. Muscle fibers, on the other hand, are specialized cells responsible for contraction and movement, not directly involved in nerve signal transmission. Dendrites are branch-like structures that receive signals from other neurons, bringing information into the cell rather than sending it out. Therefore, the axon's role as the primary transmitter of impulses solidifies its standing as the correct answer in this context.