試題詳解

5. Which of the following is true of both neurotransmitters and hormones?
(A)They are both involved in paracrine signaling.
(B)They both interact with receptors inside or on the surface of target cells.
(C)They are both produced in glands.
(D) They both travel through the bloodstream to target cells.
(E) They both influence the activity of multiple organs simultaneously.