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While Taking Her GRE Exam,LaFawnduh Was Concentrating So Hard It

Question 176

Multiple Choice

While taking her GRE exam,LaFawnduh was concentrating so hard it almost hurt and the test left her feeling exhausted.A very large share of the energy LaFawnduh expended in her "mental efforts" was consumed by the ___ in her nervous system.


A) neurons
B) stress hormones
C) sodium-potassium pump
D) mitochondria

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