brain and the nervous system

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This week we learn about the brain and the nervous system. As we learn about how chemical reactions affect us, it made me think of a question.  Do we truly control our actions and behaviors?  Or do we act based solely on the chemical reactions that happen in brains and nervous systems?  What do you think?  Which is it?  Free will or chemical reactions?  In your discussion post, which option do you agree with?  Support your response with information from either our textbook or from the video below.  Remember to earn full credit, you need to have a total of 3 responses; 1 original and 2 replies.    
YouTube URL: http://www.youtube.com/watch?v=foLf5Bi9qXs