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2 votes
These chemical messengers of the body are produced by endocrine glands

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

A. Hormones

2 Answers

6 votes

Its A which you have at the bottom of the question

User Tamikia
by
7.2k points
6 votes

A. Hormones

secreted directly into the blood

User PersianLife
by
8.9k points
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