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QUESTION
The endocrine system is comprised of a number of glands that release chemical messengers known as ____ into the ____.neurotransmitters; blood...
The endocrine system is comprised of a number of glands that release chemical messengers known as ____ into the ____.
a. neurotransmitters; blood
b. hormones; blood
c. hormones; cerebrospinal fluid
d. neurotransmitters; cerebrospinal fluid
