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MCAT Question A Day - 6/7/14 - Answer!

Novocain is a local anesthetic used by many dentists. Novocain most likely inhibits the action potential of a neuron by:

A.  stimulating calcium voltage gated channels at the synapse.
B.  increasing chloride ion efflux during an action potential.
C.  uncoiling Schwann cells wrapped around an axon.
D.  blocking sodium voltage gated channels.

D is correct. This question is testing your knowledge of an action potential. The major ions involved in the action potential are sodium and potassium. Blocking sodium channels is the only way given thawould block an action potential.

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