Which statement correctly describes the endoplasmic reticulum in neurons?

Which statement correctly describes the endoplasmic reticulum in neurons?

• A. ER stores lipids
• B. ER is not present in neurons
• C. ER generates energy
• D. Rough ER handles protein synthesis; smooth ER handles protein transport

Answer: (C)

Endoplasmic reticulum in neurons is a network that supports protein synthesis, lipid production, and calcium storage, not energy generation. The rough portion, studded with ribosomes, makes proteins destined for secretion or for incorporation into membranes—critical for neuronal receptors, channels, and signaling proteins. The smooth portion lacks ribosomes and focuses on lipid synthesis and calcium handling, which helps regulate neuronal signaling and synaptic activity. Energy for the cell comes mainly from mitochondria, not the ER. Among the given statements, the most accurate piece is that rough ER carries out protein synthesis. The claim about smooth ER handling protein transport isn’t a defining feature, and the other options are clearly inconsistent with neuronal biology (the ER is present in neurons, and it does not generate energy).

Endoplasmic reticulum in neurons is a network that supports protein synthesis, lipid production, and calcium storage, not energy generation. The rough portion, studded with ribosomes, makes proteins destined for secretion or for incorporation into membranes—critical for neuronal receptors, channels, and signaling proteins. The smooth portion lacks ribosomes and focuses on lipid synthesis and calcium handling, which helps regulate neuronal signaling and synaptic activity. Energy for the cell comes mainly from mitochondria, not the ER.

Among the given statements, the most accurate piece is that rough ER carries out protein synthesis. The claim about smooth ER handling protein transport isn’t a defining feature, and the other options are clearly inconsistent with neuronal biology (the ER is present in neurons, and it does not generate energy).