Final answer:
The node of Ranvier is a gap between two myelinated regions of an axon in biology. It allows for the strengthening and rapid transmission of nerve impulses along the axon.
Step-by-step explanation:
In biology, the node of Ranvier refers to the gap between two myelinated regions of an axon. It is an exposed area of the axon where there is no myelin sheath present.
This gap allows for the strengthening of the electrical signal as it propagates down the axon. The node of Ranvier contains voltage-gated K+ and Na+ channels, and action potentials travel down the axon by jumping from one node to the next.
Overall, the node of Ranvier plays a crucial role in speeding up the transmission of nerve impulses along the axon.