A protein is found in blood that is produced by the pancreas and acts on receptors of cells in the liver. What type of physiological regulator is it most likely to be?
A) a hormone
B) an autocrine signal
C) a paracrine signal
D) a neurotransmitter
E) an enzyme

Question

Quizplus · Accepted Answer

The protein is produced by the pancreas and acts on receptors in a distant target organ (liver), indicating that it is functioning as a hormone.

A Protein Is Found in Blood That Is Produced by the Pancreas