Given a scientific question, generate a correct answer to it.

Q: What is the outer layer of an axon that acts like a layer of insulation, similar to the plastic that encases an electrical cord?

A: myelin sheath
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Q: What also receives input from other areas of the forebrain through the medial forebrain bundle?

A: hypothalamus
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Q: What term is used to describe muscle fibers that allows muscles to contract?

A:
organelle
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