Topics: Neurons Quiz
main organ of the nervous system. protected by the skull, and made of neurons, it is the control center for all actions, thoughts and emotions.
A. brain
B. electrical impulse
C. gland
D. heart
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Made of a fatty substance that insulates and prevents the electrical current from leaving the axon.
A. myelin sheath
B. dendrite
C. axon
D. Node of Ranvier