________ are chemical messengers that are released in one tissue and transported in the bloodstream to alter the activities of specific cells in other tissues. Neuropeptides Hormones Neurotransmitters Humoral antibodies Antigens
________ are chemical messengers that are released in one tissue and transported in the bloodstream to alter the activities of specific cells in other tissues.
Neuropeptides
Hormones
Neurotransmitters
Humoral antibodies
Antigens
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