Forms of Signaling. There are four categories of chemical signaling found in multicellular organisms: paracrine signaling, endocrine signaling, autocrine signaling, and direct signaling across gap junctions.
Besides, what is a Juxtacrine signal?
In biology, juxtacrine signalling (or contact-dependent signalling) is a type of cell / cell or cell / extracellular matrix signalling in multicellular organisms that requires close contact. A membrane ligand (protein, oligosaccharide, lipid) and a membrane protein of two adjacent cells interact.
What is a paracrine signal?
Paracrine signaling is a form of cell-to-cell communication in which a cell produces a signal to induce changes in nearby cells, altering the behavior of those cells. However, the exact distance that paracrine factors can travel is not certain.
What is an endocrine signal?
Structural Biochemistry/Cell Signaling Pathways/Endocrine Signaling. These Endocrine secretions are distinguished from exocrine secretions, which are released to the external environment. Thus, endocrine signaling occurs when endocrine cells release hormones that act on distant target cells in the body.