Which of the following blocks voltage-gated sodium channels?

A) lidocaine
B) tetrodotoxin
C) pufferfish toxin
D) tetrodotoxin, pufferfish toxin and lidocaine


Ans: D) tetrodotoxin, pufferfish toxin and lidocaine

Anatomy & Physiology

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What are the two major methods by which cells communicate to coordinate their functions?

A) positive feedback loops and negative feedback loops B) chemical messengers and/or electrical signals C) effectors and responses D) temperature gradients and pressure gradients

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Sperm cells mature in the

A) epididymides. B) seminal vesicles. C) ductus deferentia. D) ejaculatory ducts.

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The primary vesicle from which the metencephalon arises is the

A.  diencephalon. B.  rhombencephalon. C.  mesencephalon. D.  myelencephalon. E.  proscencephalon.

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