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

Neurotoxins and local anesthetics both bind to and inactivate the sodium (Na⁺) channels in nerve membranes. This prevents depolarization of the membrane and blocks the conduction of nerve impulses. Additionally, some neurotoxins may also target enzymes that are responsible for breaking down neurotransmitters, leading to their accumulation and overstimulation of nerve cells. So, the answer is E, which describes both mechanisms.

Some Neurotoxins Work Essentially the Same Way as Some Local