What type of cells are primarily responsible for transmitting impulses in the nervous system?

• A. Neuroglia
• B. Neurons
• C. Afferent cells
• D. Efferent cells

Answer: (B)

Neurons are the primary cells responsible for transmitting impulses in the nervous system. They are specialized cells designed to carry signals throughout the body, allowing for communication between the brain, spinal cord, and peripheral tissues. Neurons have unique structures, including dendrites for receiving signals, a cell body where the nucleus resides, and an axon that transmits impulses away from the cell body. The transmission occurs via electrical impulses known as action potentials, which travel along the axon and are propagated at synapses to communicate with other neurons or target tissues.

Neuroglia, while important for supporting and protecting neurons, do not transmit impulses themselves; rather, they provide essential functions such as nutrient support, insulation, and maintenance of the extracellular environment. Afferent cells refer to sensory neurons that carry signals toward the central nervous system, and efferent cells refer to motor neurons that carry signals away from the central nervous system. While these terms describe types of neurons, they do not encompass the entire function of neurons in relation to impulse transmission. Therefore, the broad and encompassing role of neurons in both sensory and motor functions, as well as their fundamental role in signal transmission, makes them the key players in this process.