Tetrodotoxin Is a Heat-Stable Molecule Produced by Puffer Fish That

Multiple Choice

Tetrodotoxin is a heat-stable molecule produced by puffer fish that blocks the entry of sodium ions into neurons. About 10-45 minutes after ingestion of tetrodotoxin, tingling of the tongue and inner surface of the mouth begins. An ascending paralysis develops, and death can occur within 6-24 hours, after respiratory muscle paralysis.
-What does the puffer fish neurotoxin tetrodotoxin directly inhibit?

A) proteins involved in active transport
B) channel proteins involved in osmosis
C) proteins involved in ATP synthesis
D) channel proteins involved in diffusion
E) relaxation of muscles