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

Question

Quizplus · Accepted Answer

Hormones are the chemical messengers that are released by cells 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 in the nervous system rather than being transported through the bloodstream. Humoral antibodies and antigens are not chemical messengers, but rather components of the immune system.

________ Are Chemical Messengers That Are Released by Cells and Transported