define exciton
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- Freebase(0.00 / 0 votes)Rate this definition: Exciton. An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and in some liquids.
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Axon An axon (from Greek ἄξων axōn, áxōn), axis is a, long slender projection of a nerve, cell or, neuron that typically conducts electrical impulses away from the'neuron s cell. Body myelinated axons are known as nerve. fibersxon dysfunction causes many inherited and acquired neurological disorders which can affect both the peripheral and central neurons. An axon is one of two types of protoplasmic protrusions that extrude from the cell body of a neuron, the other type being dendrites.
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excitation-contraction coupling excitation-contraction coupling. the link between excitation of muscle membrane and initiation of force generation at cross-bridges, producing muscle contraction. In all types of muscle this involves a rise in cytoplasmic calcium concentration [Ca 2+ ] but mechanisms for this rise differ substantially.xcitation-conduction-contraction. in the stimulation of muscle contraction this is the coupling which occurs at the sarcolemma-sarcoplasmic reticulum junction. Mediated by the release of calcium ions in the aqueous sarcoplasm.
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excitation excitation. an act of irritation or stimulation; a condition of being excited or of responding to a stimulus; the addition of energy, as the excitation of a molecule by absorption of photons. anomalous atrioventricular excitation Wolff-Parkinson-White syndrome.
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- An axon (from Greek ἄξων axōn, áxōn), axis is a, long slender projection of a nerve, cell or, neuron that typically conducts electrical impulses away from the'neuron s cell. bodyn axon (from Greek ἄξων axōn, áxōn), axis is a, long slender projection of a nerve, cell or, neuron that typically conducts electrical impulses away from the'neuron s cell. Body myelinated axons are known as nerve. fibers
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axon axon. the process of a nerve cell along which impulses travel away from the cell body. It branches at its termination, forming synapses at other nerve cells or effector organs. Many axons are covered by a myelin sheath formed from the cell membrane of a glial or Schwann cell. axon hillock. the elevation on the perikaryon from which the axon emerges. axon reflex. a nerve impulse conducted through nerve pathways limited to the single axon, without the participation of a nerve cell or synapse. Not a true reflex. axon telodendrion. extensive terminal branches of the axon before terminating on the effector organ.
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Exon Genes contain exons which are regions coding for proteins and which are interrupted by the unused sequences called introns. Exons have been found to include both sequences coding for amino acids and untranslated sequences. The introns are removed and the exons are joined together to form the final functional mRNA.
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Exothermic process In thermodynamics, the term exothermic process (exo- : outside) describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen).
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Exothermic process In thermodynamics, the term exothermic process (exo- : outside) describes a process or reaction that releases energy from the system, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen).
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Exocytosis 8. Recaptured neurotransmitter. Exocytosis (/ˌɛksɵsaɪˈtoʊsɨs/) is a form of active transport in which a cell transports molecules (such as proteins) out of the cell (exo- + cytosis) by expelling them in an energy-using process.
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- WordReference Random House Unabridged Dictionary of American English © 2016. ex•clu•sion (ik sklo̅o̅′zhən), n. 1  an act or instance of excluding. 2  the state of being excluded. [ Physiol.]a keeping apart; blocking of an entrance.
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Excitation-contraction coupling in skeletal muscle Excitation-contraction coupling in skeletal muscle. Excitation - contraction coupling in the skeletal muscle is the sequence of events through which the nerve fiber stimulates the skeletal muscle fiber causing its contraction.
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MASTERING A & P A&P CHAPTER 9 MUSCLES Excitation-contraction coupling is a series of events that occur after the events of the neuromuscular junction have transpired. The term excitation refers to which step in the process? A. Excitation refers to the release of calcium ions from the sarcoplasmic reticulum.
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Axon For other uses, see Axon (disambiguation). An axon (from Greek ἄξων áxōn, axis), is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. Myelinated axons are known as nerve fibers. The function of the axon is to transmit information to different neurons, muscles and glands.
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- An axon (from Greek ἄξων axōn, áxōn), axis is a, long slender projection of a nerve, cell or, neuron that typically conducts electrical impulses away from the'neuron s cell. bodyhen an action potential reaches a presynaptic terminal, it activates the synaptic transmission process. The first step is rapid opening of calcium ion channels in the membrane of the axon, allowing calcium ions to flow inward across the membrane.
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In biology, what are introns and exons? Description: In most eukaryotic genes, coding regions (exons) are interrupted by noncoding regions (introns). During transcription, the entire gene is copied into a pre-mRNA, which includes exons and introns. During the process of RNA splicing, introns are removed and exons joined to form a contiguous coding sequence.
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action potential An all-or-none electrical event (neural impulse) in an axon or muscle fibre in which the polarity of the membrane potential is rapidly reversed and re-established. Action potentials begin at one end of the axon of a neurone and move along the axon to the other end.ction potential. the nerve impulse, the sign of activity and the basis of activity in individual neurons in the nervous system. The measure of the activity of an individual nerve cell is indicated by the frequency of its discharge.
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bouton axon. The threadlike process of a neuron which conducts nerve impulses from the cell body to the neuron's ending (bouton) where it is transmitted via a synapse to another neuron, muscle or gland. Syn.nerve fibre (when it is sheathed).See neuron; synapse.he threadlike process of a neuron which conducts nerve impulses from the cell body to the neuron's ending (bouton) where it is transmitted via a synapse to another neuron, muscle or gland. Syn. nerve fibre (when it is sheathed). See neuron; synapse.
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Physiology Exam #2 Excitation-contraction coupling in skeletal muscle. 4 reviews228615069. Thank you for your review (★) Excitation - contraction coupling in the skeletal muscle is the sequence of events through which the nerve fiber stimulates the skeletal muscle fiber causing its contraction.
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- An axon (from Greek ἄξων axōn, áxōn), axis is a, long slender projection of a nerve, cell or, neuron that typically conducts electrical impulses away from the'neuron s cell. Body myelinated axons are known as nerve. Fibers the function of the axon is to transmit information to different, neurons muscles and. glands
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- Noun. 1. axon-long nerve fiber that conducts away from the cell body of the neuron. axone. nerve fiber, nerve fibre-a threadlike extension of a nerve cell.nerve cell, neuron-a cell that is specialized to conduct nerve impulses. nerve end, nerve ending-the terminal structure of an axon that does not end at a synapse.Translations.erve fiber, nerve fibre-a threadlike extension of a nerve cell. nerve cell, neuron-a cell that is specialized to conduct nerve impulses. nerve end, nerve ending-the terminal structure of an axon that does not end at a synapse. Translations.
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- by a function of time. It means that the force is generated by a. source with infinite power (ideal). However, if in a certain model. the ideal source is replaced by a source with limited power (non-. ideal), then the excitation must be put in the form of a function. which depends on the response of the system.
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User Contributed Dictionary This page is about the quasiparticle. Exciton is also the title of a single by IDM composer Squarepusher. An exciton is a bound state of an electron and an imaginary particle called an electron hole in an insulator or semiconductor, and such is a Coulomb-correlated electron-hole pair.It is an elementary excitation, or a quasiparticle of a solid.n exciton is a bound state of an electron and an imaginary particle called an electron hole in an insulator or semiconductor, and such is a Coulomb-correlated electron-hole pair.
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- In thermodynamics, the term exothermic process (exo- : outside) describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard
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- An axon (from Greek ἄξων axōn, áxōn), axis is a, long slender projection of a nerve, cell or, neuron that typically conducts electrical impulses away from the'neuron s cell. Body myelinated axons are known as nerve. fibersome types of neurons have no axon and transmit signals from their dendrites. No neuron ever has more than one axon; however in invertebrates such as insects or leeches the axon sometimes consists of several regions that function more or less independently of each other.
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Axon An axon (from Greek ἄξων axōn, áxōn), axis is a, long slender projection of a nerve, cell or, neuron that typically conducts electrical impulses away from the'neuron s cell. Body myelinated axons are known as nerve. fibershen an action potential reaches a presynaptic terminal, it activates the synaptic transmission process. The first step is rapid opening of calcium ion channels in the membrane of the axon, allowing calcium ions to flow inward across the membrane.