When a neuron is sufficiently stimulated it
A) becomes very negatively charged relative to outside of the cell.
B) initiates an action potential.
C) expands in size.
D) closes all of its membrane pores.
Answer: B
Rationale: When a neuron is stimulated past a certain threshold, it initiates an action potential. During an action potential, a wave of electrical activity originates at the base of the axon and rapidly travels down its length. The action potential moves down the length of the axon as positively charged ions rush through the membrane pores. During the action potential the net charge of the cell goes from negatively to positively charged.
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