When Anesthesia or Toxins, Such as Tetrodotoxin from the Puffer

Multiple Choice

When anesthesia or toxins, such as tetrodotoxin from the puffer fish, block a sodium channel, they

A) prevent an action potential from occurring.
B) cause a negative after-potential to occur.
C) decrease the amount of dopamine at the receptor sites.
D) cause an excessive release of acetylcholine into the synaptic cleft.