... chemically mediated by rapid secretion of neurotransmitter
molecules . Pre-synaptic neurons (i.e.the ... at the tip of an axon triggers the release of neurotransmitter
at a synaptic gap . Neurotransmitters can ... will only be triggered in the target cell if neurotransmitter
molecules acting on their post-synaptic ...
... neuron . A chemical is classified as a neurotransmitter
if it respects the following conditions:
It ... of action
Within the cells , small-molecule neurotransmitter
molecules are packaged in vesicles . When an ... ion channels that open or close through neurotransmitter
binding. Metabotropic receptor effects on ion ...
... part of a cell. The parts of synapses where neurotransmitter
is released are called the active zones . At ... across chemical synapses
The release of neurotransmitter
is triggered by the arrival of a nerve impulse ... nerve terminal, vesicles containing neurotransmitter
sit "docked" and ready at the synaptic membrane. ...
... of nerve and muscle, and the voltage-gated calcium channels that control neurotransmitter
release in pre-synaptic endings .
Ligand-gated channels open in ... the "nicotinic" Acetylcholine receptor , AMPA receptor and other neurotransmitter
Cyclic nucleotide-gated channels , ...
... transduction is the signal amplification . The binding of one or a few neurotransmitter
molecules can enable the entry of millions of ions. The binding of one or ... in a multitude of processes, among them muscle contraction, release of neurotransmitter
from nerve endings, vision in retina cells, proliferation , ...
List of physics topics
Nobel Prize in Physiology or Medicine
... acid to tetrahydrofolic acid
DNA gyrase : catalyzes the negative supercoiling of prokaryotic DNA
Glutamate decarboxylase : synthesizes the neurotransmitter
GABA in the brain
Glutathione peroxidase : protects cells by converting hydrogen peroxide to water
Isomerase : all those enzymes which ...
... by the nerves , the motor nerves and motoneurons in particular. All skeletal muscle and many smooth muscle contractions are facilitated by the neurotransmitter
Muscles and muscular activity account for most of the body's energy consumption. Muscles store energy for their own use in the ...
... the nervous system occurs by two primary mechanisms:
Within neuronal nerve fibers by way of action potentials
Between neurons by way of neurotransmitter
diffusion across synapses .
Vertebrate nervous systems
The nervous systems of vertebrate animals are often divided into a central ...
... stimuli, produces an informative nerve impulse .
In biochemistry , a receptor is a protein molecule that receives and responds to a specific neurotransmitter
, hormone , or other substance.
In immunology , a receptor is the region of an antibody which shows recognition of an antigen .
Selective serotonin reuptake inhibitor
... Selective serotonin reuptake inhibitors ( SSRIs ) are a class of antidepressants . They act within the brain to increase the amount of the neurotransmitter
, serotonin (5-hydroxytryptamine or 5-HT), in the synaptic gap by inhibiting its reuptake . One notable characteristic of SSRIs is that, unlike ...
... "loops" sticking out of the membrane. By definition. a receptor's main function is to recognize and respond to a specific ligand, for example, a neurotransmitter
or hormone (although certain receptors respond also to changes in transmembrane potential ), and in many receptors these ligands bind to the ...