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

Question

Quizplus · Accepted Answer

Hormones are chemical messengers that are released by endocrine glands in one tissue and transported in the bloodstream to alter the activities of specific cells in other tissues. Neuropeptides and neurotransmitters are also chemical messengers, but they act locally within the nervous system. Humoral antibodies and antigens are involved in the immune system and not in cell communication through chemical messengers.

________ Are Chemical Messengers That Are Released in One Tissue