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These chemical messengers of the body are produced by endocrine glands A. Hormones B . Neurotransmitters C. Adenosine Tri-phosphates (ATP) D. Acetylcholines A. Hormones
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These chemical messengers of the body are produced by endocrine glands

A. Hormones
B . Neurotransmitters
C. Adenosine Tri-phosphates (ATP)
D. Acetylcholines

A. Hormones

User Tushar Patil
by
5.0k points

2 Answers

6 votes

Its A which you have at the bottom of the question

User Tamikia
by
4.1k points
6 votes

A. Hormones

secreted directly into the blood

User PersianLife
by
6.0k points
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