Which cells are the primary signaling cells of the nervous system?

Which cells are the primary signaling cells of the nervous system?

• A. Neurons
• B. Glia
• C. Astrocytes
• D. Schwann cells

Answer: (A)

Neurons are the primary signaling cells because they are specialized to generate action potentials and transmit signals over long distances via axons, then communicate across synapses through neurotransmitters. This electrical-chemical signaling is how the nervous system rapidly conveys information. Glial cells provide essential support and modulate signaling but do not carry signals as the main function. For example, astrocytes help maintain the extracellular environment and metabolic support, while Schwann cells in the peripheral nervous system insulate axons with myelin to speed conduction. These supportive roles are crucial for signaling, but the actual transmission of signals is carried out by neurons.

Neurons are the primary signaling cells because they are specialized to generate action potentials and transmit signals over long distances via axons, then communicate across synapses through neurotransmitters. This electrical-chemical signaling is how the nervous system rapidly conveys information. Glial cells provide essential support and modulate signaling but do not carry signals as the main function. For example, astrocytes help maintain the extracellular environment and metabolic support, while Schwann cells in the peripheral nervous system insulate axons with myelin to speed conduction. These supportive roles are crucial for signaling, but the actual transmission of signals is carried out by neurons.