The Nervous System

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1
B
2            3         
P H O T O R E C E P T O R
   
O A
   
C I
  4 
H G N
   
L L
567  8           
M N V E R T E B R A E
9             
N E R V E E A N
       
D U T D
10  11             
C E R E B R U M R I
      12           
E E L H O R M O N E
         
R F L N A
     
E L A
   
B E
   
E X
 
L
 
L
 
U
 
M

Across

  1. a special neuron that changes light into electrical impulses
  2. _________ protect the spinal cord.
  3. a collection of nerve fibers through which impulses travel between the central nervous system and other parts of the body
  4. the largest part of your brain
  5. a substance that is made in one cell or tissue and that causes a change in another cell or tissue in a different part of the body

Down

  1. the mass of nerve tissue that is the main control center of the nervous system
  2. a fluid-filled organ of the inner ear
  3. a group of cells that make special chemicals fo the body
  4. Part of the brain that connects to your spinal cord
  5. a nerve cell that is specialized to receive and conduct electrical impulses
  6. a layer of light-sensitive cells
  7. Your __________ causes skeletal muscles to make adjustments so that you will stay upright.
  8. an involuntary and almost immediate movement in response to a stimulus


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