Sodium channels are specifically blocked by:

A) Nifedipine
B) Tetradotoxin
C) Tetra Ethyl lead
D) Choline

The correct answer is B) Tetradotoxin.

The toxin is present in Puffer Fish. Tetradotoxin - toxin of Tetraodon - Tetraodon is basically Scientific name for Puffer Fish. The word Tetraodon is Tetra + odon which means four teeth, it is because a puffer fish has just four teeth, yes really.

Tetra - four
Odon - dentine - dentist - Odontology - Teeth

Puffer fish is seen as a delicacy is Japan but to serve it' s meat, the chef requires a lot of skills as Puffer Fish or Fugu fish as it is called there can be very poisonous if not prepared or cut properly.

-Syed Moris

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