The nervous system and endocrine system control the body's functions by 
maintaining a constant level of nerve impulses  
  
 sending out messages by nerve impulse and hormones  
  
 responding only to the internal environment  
  
 stimulating the body's reproductive organsThe nervous system and endocrine system control the body's functions by?
Sending out messages by nerve impulse (nervous) and hormones (endocrine).
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