The correct answer is C. myelin sheath.
1. The myelin sheath is a fatty, insulating layer that surrounds the axon of a neuron.
2. It serves to protect the axon and helps in the efficient transmission of electrical impulses (signals) along the nerve cell.
3. By insulating the axon, the myelin sheath prevents the signal from leaking out or being disrupted as it travels along the length of the axon.
4. This insulation allows the signal to move faster and more efficiently, aiding in rapid communication between neurons.
In summary, the myelin sheath plays a crucial role in protecting and insulating the signal as it moves along the axon, ensuring effective transmission of nerve impulses.
