Receptor potential

Receptor potential

Receptor potential, a type of graded potential, is the transmembrane potential difference of a sensory receptor.

A receptor potential is often produced by sensory transduction. It is generally a depolarizing event resulting from inward current flow. The influx of current will often bring the membrane potential of the sensory receptor towards the threshold for triggering an action potential.

A receptor potential is a form of graded potential, as is a generator potential. It arises when the receptors of a stimulus are separate cells. An example of this is in a taste bud, where taste is converted into an electrical signal sent to the brain. When stimulated the taste bud triggers the release of neurotransmitter through exocytosis of synaptic vesicles from the presynaptic membrane. The neurotransmitter molecules diffuse across the synaptic cleft to the postsynaptic membrane. A postsynaptic potential is then produced in the first order neurone, and if the stimulus is strong enough to reach threshold this may generate an action potential which may propagate along the axon into the central nervous system.

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • receptor potential — n GENERATOR POTENTIAL * * * generator p …   Medical dictionary

  • receptor potential — The transmembrane potential difference of a sensory cell. Such cells are not generally excitable, but their response to stimulation is a gradual change in their resting potential …   Dictionary of molecular biology

  • Transient receptor potential channel — Transient receptor potential or TRP channels are a family of loosely related ion channels that are non selectively permeable to cations, including calcium and magnesium. TRP channels were discovered in mutant Drosophila that, instead of having… …   Wikipedia

  • transient receptor potential channel — ▪ biology also called  TRP channel    superfamily of ion channels occurring in cell membranes (cell) that are involved in various types of sensory reception (senses), including thermoreception, chemoreception, mechanoreception, and photoreception …   Universalium

  • Receptor sensor de calcio — HUGO 1514 Símbolo CASR Símbolos alt. CAR; FHH; FIH; GPRC2A; HHC; HHC1; MGC138441; NSHPT; P …   Wikipedia Español

  • Potential effects of tea on health — This article only deals with the effects of tea which is made from the plant Camellia sinensis (i.e. black tea, oolong tea, green tea and white tea). This page does not deal with the effects of other teas. The potential effects of tea on health… …   Wikipedia

  • Receptor antagonist — This article is about the biochemistry term. For other uses, see Antagonist (disambiguation). Antagonists will block the binding of an agonist at a receptor molecule, inhibiting the signal produced by a receptor agonist coupling. A receptor… …   Wikipedia

  • potential — 1. Capable of doing or being, although not yet doing or being; possible, but not actual. 2. A state of tension in an electric source enabling it to do work under suitable conditions; in relation to electricity, p. is analogous to the temperature… …   Medical dictionary

  • Receptor-ligand kinetics — In biochemistry, receptor ligand kinetics is a branch of chemical kinetics in which the kinetic species are defined by different non covalent bindings and/or conformations of the molecules involved, which are denoted as receptor(s) and ligand(s) …   Wikipedia

  • generator potential — gen·er·a·tor potential jen ə .rāt ər n stationary depolarization of a receptor that occurs in response to a stimulus and is graded according to its intensity and that results in an action potential when the appropriate threshold is reached called …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”