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colleen colleen
wrote...
Valued Member
Posts: 17077
9 years ago
Most  _______ are secreted into the extracellular fluid from endocrine glands or tissues.
a. neurotransmitters
b. neuropeptides
c. modulators
d. hormones
e. pheromones
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Sunshine ☀ ☼
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Answer accepted by topic starter
ThePsychicThePsychic
wrote...
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Posts: 11223
9 years ago
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