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    Exam 4: The Brain: Source of Mind and Self
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    How Many Substances Are Known or Suspected to Be Neurotransmitters
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How Many Substances Are Known or Suspected to Be Neurotransmitters

Question 17

Question 17

Multiple Choice

How many substances are known or suspected to be neurotransmitters?


A) 8 to 10
B) thousands
C) 15 to 20
D) hundreds

Correct Answer:

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