What is the primary effect of local anesthetics on nerve conduction?

What is the primary effect of local anesthetics on nerve conduction?

• A. They enhance nerve conduction velocity
• B. They block action potentials
• C. They increase neurotransmitter release
• D. They facilitate nerve regeneration

Answer: (B)

Local anesthetics primarily work by blocking action potentials in nerve fibers. They achieve this by inhibiting voltage-gated sodium channels on the neuronal cell membrane. When these channels are blocked, the influx of sodium ions that is necessary for depolarization during an action potential is prevented. As a result, the propagation of nerve impulses is interrupted, leading to the loss of sensation in the area innervated by the affected nerves. Understanding the mechanism of local anesthetics is important for their application in clinical settings, such as during surgical procedures, where temporary loss of sensation is required. The ability to effectively block nerve conduction allows for pain management during and after surgical interventions.

Local anesthetics primarily work by blocking action potentials in nerve fibers. They achieve this by inhibiting voltage-gated sodium channels on the neuronal cell membrane. When these channels are blocked, the influx of sodium ions that is necessary for depolarization during an action potential is prevented. As a result, the propagation of nerve impulses is interrupted, leading to the loss of sensation in the area innervated by the affected nerves.

Understanding the mechanism of local anesthetics is important for their application in clinical settings, such as during surgical procedures, where temporary loss of sensation is required. The ability to effectively block nerve conduction allows for pain management during and after surgical interventions.