A chemical signal produced in the pituitary gland at the base of the brain binds to a receptor on liver cells.This signal would be classified as a(n)
A) paracrine signal.
B) juxtacrine signal.
C) agonist.
D) antagonist.
E) hormone.

Question

Quizplus · Accepted Answer

The chemical signal produced in the pituitary gland at the base of the brain is a hormone because it is a signaling molecule that is produced in one part of the body and transported to another part of the body where it exerts its effect, binding to a receptor on liver cells. Paracrine signals act locally on neighboring cells, juxtacrine signals involve direct cell-to-cell contact, agonists activate a receptor to produce a biological response, and antagonists bind to a receptor but do not activate it, blocking the biological response.

A Chemical Signal Produced in the Pituitary Gland at the Base