Define intracellular mediator in your own words. Spaced Practice o Now choose from one of the following options Why? cell-surface receptor that forms a

Define intracellular mediator in your own words. Spaced Practice o Now choose from one of the following options Why? 

а cell-surface receptor that forms a plasma membrane channel, which opens when a ligand binds to the extracellular domain (ligand-gated channels)

b molecule produced by a signaling cell that binds with a specific receptor, delivering a signal in the process

c (also, second messenger) small molecule that transmits signals within a cell

d cell-surface protein that transmits a signal from the exterior of the cell to the interior. even though the ligand does not enter the cell Submit Comes from 9.1 Signaling Molecules and Cellular Receptors ID# 1336596 Suggest a correction.