Some neurotoxins work essentially the same way as some local anesthetics,which is to A) inactivate the enzyme that destroys the neurotransmitter only. B) bind to Na⁺ channels and inactivate them only. C) prevent depolarization by blocking Na⁺ entry into the cell only. D) inactivate the enzyme that destroys the neurotransmitter and bind to Na⁺ channels and inactivate them. E) bind to Na⁺ channels and inactivate them and prevent depolarization by blocking Na⁺ entry into the cell.

Question

Quizplus · Accepted Answer

Some neurotoxins, such as lidocaine, work by binding to Na+ channels and inactivating them, thereby preventing depolarization and subsequent transmission of nerve signals. This is the same mechanism by which local anesthetics work. Therefore, the answer is E, which states that neurotoxins bind to Na+ channels and inactivate them, as well as prevent depolarization by blocking Na+ entry into the cell.

Some Neurotoxins Work Essentially the Same Way as Some Local