Nissl bodies are primarily associated with which cellular process?

• A. Protein Synthesis
• B. Energy Production
• C. Lipid Metabolism
• D. Waste Removal

Answer: (A)

Nissl bodies are the neuron’s protein-making centers. They are clusters of rough endoplasmic reticulum studded with ribosomes, which gives them a high RNA content that stains with basic dyes. This arrangement makes them the primary site where neurons synthesize proteins, including those needed for membrane channels, neurotransmitter machinery, and cytoskeletal components that support neuron structure and function.

Energy production is handled mainly by mitochondria, which generate ATP. Lipid metabolism involves enzymes more related to the smooth endoplasmic reticulum and other pathways, not the rough ER. Waste removal relies on lysosomes and related pathways, not Nissl bodies.