a: nervous system ~
b: two sets of one-way streets
What:
"The nervous system is like two sets of one-way streets Through one set of nerves, the sensors tell the brain what they sense Through another set of nerves, the brain tells the muscles to contract and cause the body to move."
Useful?
Writer: Not Stated
LCC:
Where:
Date: Mar 9 2014 1:28 PM
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