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1. Endocrine glands ________.
 
 
 
 

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2. Chemical signaling that affects neighboring cells is called ________.
 
 
 
 

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3. Critical Thinking: Describe several main differences in the communication methods used by the endocrine system and the nervous system.

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4. Critical Thinking: Compare and contrast endocrine and exocrine glands.

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5. Critical Thinking: True or false: Neurotransmitters are a special class of paracrines. Explain your answer.

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