Which neuron structure primarily receives signals from other neurons?

Which neuron structure primarily receives signals from other neurons?

• A. Soma
• B. Dendrites
• C. Axon
• D. Myelin sheath

Answer: (B)

Dendrites are the structures that primarily receive signals from other neurons. They branch out from the cell body and are studded with receptors at synapses where neurotransmitters released by neighboring neurons bind. This chemical binding opens ion channels and creates graded potentials—small electrical changes that reflect the strength and number of incoming signals. These signals are then integrated as they travel toward the soma and, if sufficient, trigger an action potential to move along the axon. The soma, or cell body, houses the nucleus and supports cellular metabolism, and it does contribute to processing inputs, but the main receiving surfaces for synaptic input are the dendrites. The axon, in turn, is the conducting cable that transmits the signal away from the neuron, and the myelin sheath around the axon speeds this transmission without serving as a primary site for receiving signals.

Dendrites are the structures that primarily receive signals from other neurons. They branch out from the cell body and are studded with receptors at synapses where neurotransmitters released by neighboring neurons bind. This chemical binding opens ion channels and creates graded potentials—small electrical changes that reflect the strength and number of incoming signals. These signals are then integrated as they travel toward the soma and, if sufficient, trigger an action potential to move along the axon.

The soma, or cell body, houses the nucleus and supports cellular metabolism, and it does contribute to processing inputs, but the main receiving surfaces for synaptic input are the dendrites. The axon, in turn, is the conducting cable that transmits the signal away from the neuron, and the myelin sheath around the axon speeds this transmission without serving as a primary site for receiving signals.