Concept
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Forms of Signaling
Forms of Chemical Signaling
In chemical signaling, a cell may target itself (autocrine signaling), a cell connected by gap junctions, a nearby cell (paracrine signaling), or a distant cell (endocrine signaling). Paracrine signaling acts on nearby cells, endocrine signaling uses the circulatory system to transport ligands, and autocrine signaling acts on the signaling cell. Signaling via gap junctions involves signaling molecules moving directly between adjacent cells.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Signaling Molecules and Cellular Receptors. October 16, 2013."
http://cnx.org/content/m44451/latest/Figure_09_01_01.jpg
OpenStax CNX
CC BY 3.0.