Final answer:
Nerve structures are vulnerable to blockages in conduction due to the importance of ion movement in signal transmission, with local anesthetics being a common factor that can induce a temporary block by interfering with sodium channels.
Step-by-step explanation:
The structures in the nervous system are vulnerable to nerve conduction block due to their reliance on the movement of ions across membranes to generate electrical signals. These electric signals, which are transmitted along neurons, depend on a delicate balance of sodium and potassium ions moving in and out of the cell through specialized channels. Myelin sheaths that wrap around the axons of neurons are crucial for speeding up the signal propagation. A nerve conduction block can be induced by factors such as local anesthetics like lidocaine, which is a sodium channel blocker. Local anesthetics prevent the initiation and transmission of electrical impulses by blocking these channels, leading to temporary sensory and motor paralysis in the affected area.