Final answer:
The density of voltage-gated sodium channels in the internode is lower compared to the node, due to their clustering at the nodes of Ranvier. This clustering allows for faster propagation of action potentials in myelinated neurons, known as saltatory conduction.
Step-by-step explanation:
The density of voltage-gated sodium channels in the internode is lower compared to the node. Voltage-gated sodium channels are responsible for the opening and closing of sodium channels in the cell membranes of nerve cells. They play a crucial role in generating and propagating action potentials along the axon. In myelinated neurons, these channels are clustered at the nodes of Ranvier, which are the gaps in the myelin sheath that occur along the axon. The clustering of sodium channels at the nodes of Ranvier allows for faster propagation of action potentials, known as saltatory conduction.