What is the basic functional unit of the nervous system that conducts electrical impulses?

What is the basic functional unit of the nervous system that conducts electrical impulses?

• A. Neuron
• B. Glial cell
• C. Muscle fiber
• D. Epithelial cell

Answer: (A)

Neurons are the basic functional unit of the nervous system because they are specialized to generate and propagate electrical signals, called action potentials, that travel along their length to communicate with other neurons or effector cells. A neuron’s structure—dendrites to receive inputs, a cell body to integrate signals, and an axon to carry impulses—enables rapid, long-distance signaling. The movement of ions across the membrane during an action potential and, in many cells, the insulating myelin sheath to speed conduction, underpin this electrical communication. When the impulse reaches a synapse, neurotransmitters release to transfer the signal to the next cell. Glial cells provide support but don’t conduct electrical impulses themselves, muscle fibers respond to neural input rather than conducting the signal along the nervous system, and epithelial cells line surfaces without transmitting nerve signals.

Neurons are the basic functional unit of the nervous system because they are specialized to generate and propagate electrical signals, called action potentials, that travel along their length to communicate with other neurons or effector cells. A neuron’s structure—dendrites to receive inputs, a cell body to integrate signals, and an axon to carry impulses—enables rapid, long-distance signaling. The movement of ions across the membrane during an action potential and, in many cells, the insulating myelin sheath to speed conduction, underpin this electrical communication. When the impulse reaches a synapse, neurotransmitters release to transfer the signal to the next cell. Glial cells provide support but don’t conduct electrical impulses themselves, muscle fibers respond to neural input rather than conducting the signal along the nervous system, and epithelial cells line surfaces without transmitting nerve signals.