Which part of a sensory neuron is responsible for protein synthesis and is not involved in impulse transmission?

Which part of a sensory neuron is responsible for protein synthesis and is not involved in impulse transmission?

• A. Dendritic zone
• B. Soma
• C. Axon hillock
• D. Synaptic knobs

Answer: (B)

In neurons, the cell body (soma) is where most protein synthesis happens. It contains the nucleus, rough endoplasmic reticulum, and ribosomes that produce the proteins the neuron needs—like ion channels, receptors, and enzymes to maintain and remodel the cell. Impulse transmission, on the other hand, happens along the axon—from the axon hillock toward the synaptic terminals—so that process is carried out by the axon and its terminals, not by the soma. Dendrites mainly receive signals, and synaptic knobs release neurotransmitters, but neither is the primary site for producing these proteins. So the soma is the part that makes proteins and is not used for transmitting impulses.

In neurons, the cell body (soma) is where most protein synthesis happens. It contains the nucleus, rough endoplasmic reticulum, and ribosomes that produce the proteins the neuron needs—like ion channels, receptors, and enzymes to maintain and remodel the cell. Impulse transmission, on the other hand, happens along the axon—from the axon hillock toward the synaptic terminals—so that process is carried out by the axon and its terminals, not by the soma. Dendrites mainly receive signals, and synaptic knobs release neurotransmitters, but neither is the primary site for producing these proteins. So the soma is the part that makes proteins and is not used for transmitting impulses.