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SystoleMembrane PotentialsCalciumDiastolePotassiumAction PotentialsMyocardial ContractionElectrophysiologyCortical Spreading DepressionHeart VentriclesPatch-Clamp TechniquesVentricular FunctionHeartElectric StimulationTetrodotoxinMitral ValveNeuronsNeuromuscular Depolarizing AgentsKinetocardiographyEchocardiographyElectric ConductivityBlood Flow VelocitySodiumTime FactorsVentricular Function, LeftModels, CardiovascularIon ChannelsCalcium ChannelsDogsGuinea PigsCardiac VolumePotassium ChannelsEchocardiography, DopplerPotassium ChlorideCalcium Channel BlockersAtrial Function, LeftAtrial FunctionMitral Valve ProlapseCardiac-Gated Imaging TechniquesIon Channel GatingTetraethylammonium CompoundsSynaptic TransmissionEchocardiography, Three-DimensionalHeart AuscultationMitral Valve InsufficiencyTetraethylammoniumBariumElectrocardiographyRats, Sprague-DawleyChloridesMicroelectrodesSodium ChannelsSynapsesEvoked PotentialsStroke Volume4-AminopyridineHemodynamicsCoronary CirculationCalcium SignalingHeart AtriaMyocardiumPotassium Channel BlockersMuscle ContractionHeart RateEgtazic AcidBlood PressureCells, CulturedNifedipineCalcium Channels, L-TypeEchocardiography, Doppler, ColorHeart SoundsVeratridineHeart Conduction SystemEchocardiography, Doppler, PulsedKineticsTorsion, MechanicalMembrane Potential, MitochondrialVentricular Function, RightPapillary MusclesCesiumRats, WistarAcetylcholinegamma-Aminobutyric AcidCell MembraneHeart SeptumFluorescent DyesMuscarinePulseMitochondriaExcitatory Postsynaptic PotentialsGanglia, SympatheticVentricular PressureGlutamic AcidHippocampusMuscle, SmoothCaffeinePericardiumCardiomyopathy, HypertrophicRabbitsCell Membrane Permeability
Atrial depolarizationDiastoleExtra systolesSpontaneous depolarizationVentriclesRepresentsPacemakerPhaseGradualMembraneIonsCorrespondsVenousRepolarisationHeartInfluxCellsTrueRepolarizationAtriaConductionAorticVentricular contractionOccursAtrioventricular valvesWaveCardiac muscle cellsAortaSodiumIsovolumetricHeartbeatPhaseCalciumPhasesComplexBloodElectricalContractPressureLeftCorrect answerNormalEssential
Atrial depolarization2
  • In the electrocardiogram: wave "P" corresponds to the onset of atrial depolarization, waves "QRS" (aka QRS complex) correspond to the onset of ventricular depolarization, and wave "T" corresponds to ventricular repolarization. (thehollowearthinsider.com)
  • the P wave represents the SA node and atrial depolarization. (correctionalnurseeducator.net)
Diastole8
Extra systoles4
  • Elevated cytosolic calcium can provoke oscillatory depolarizations of the cardiac membrane and trigger sustained action potential generation and extra systoles. (medscape.com)
  • Increased intracellular concentrations of calcium have been suggested as a cause of depolarization of the cardiac membrane and, therefore, a trigger of sustained action potentials, extra systoles, and tachycardia (sinus, supraventricular, or ventricular). (medscape.com)
  • He was having 2345 extra systoles per day. (q10facts.com)
  • His extra systoles were now only 50 per day. (q10facts.com)
Spontaneous depolarization1
  • This is why the main feature of digitalis intoxication are arrhythmias due to ectopic electric impulses and spontaneous depolarization (there is overloading of conducting system by Calcium as well as excess amounts of Noradrenaline released from sympathetic endings). (stackexchange.com)
Ventricles3
  • To put this another way, contractility is the ability of cardiac muscle cells to contract in the ventricles after depolarization. (nursesed.net)
  • What identifies depolarization of the atria, ventricles and perkinje fibers? (assignguru.com)
  • Coordinated contractions of cardiac muscle cells during systole propel blood out of the atria and ventricles to the blood vessels of the systemic and pulmonary circulatory systems . (wikidoc.org)
Represents3
Pacemaker3
  • This upward drift towards a gradual DEPOLARIZATION is called the pacemaker potential. (studymoose.com)
  • In fact, CoQ10 seems to stabilize the heart cell membranes and to prevent cells other than the A-V and V pacemaker nodes from initiating ventricular systoles. (q10facts.com)
  • The known mechanism for CoQ10 in preventing cardiac arrhythmia is that CoQ10 stabilizes the cellular membranes of cardiac cells, thus preventing cardiac cell depolarization except for those cells in the cardiac pacemaker system. (q10facts.com)
Phase1
  • Phase 0: Rapid depolarization is caused by a sudden influx of Na + ions. (mhmedical.com)
Gradual1
  • In slow-response cells, resting transmembrane potential is slightly less negative (around -60 mV) and is followed by gradual diastolic depolarization, which is responsible for the property of automaticity. (mhmedical.com)
Membrane1
Ions1
  • 1980. Selective depression of excitatory amino-acid induced depolarizations by magnesium ions in isolated spinal cord preparations. (cdc.gov)
Corresponds1
Venous1
  • 0001 ua s-wave peak velocity across the united states, the vector of depolarization is orthogonal to the systemic venous structure, most com- mon, results from prolapse of the arte- rial bed. (lowerbricktown.com)
Repolarisation1
  • ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. (hssliveguru.com)
Heart2
  • Systole (/ˈsɪstəli/ SIST-ə-lee) is the part of the cardiac cycle during which some chambers of the heart contract after refilling with blood. (wikipedia.org)
  • Loss of normal electrical conduction in the heart-as seen during atrial fibrillation, atrial flutter, and complete heart block-may eliminate atrial systole completely. (wikipedia.org)
Influx1
  • Depolarization: Fast voltage-gated Na + channels open at -65 mV → rapid Na + influx into the cell → TMP rises further until slightly above 0 mV. (thecore9.com)
Cells1
  • Cardiac systole is the contraction of the cardiac muscle in response to an electrochemical stimulus to the heart's cells (cardiomyocytes). (wikipedia.org)
True1
Repolarization8
  • This represents the period from the onset of ventricular depolarization to completion of repolarization of the ventricular myocardium, or ventricular systole. (unboundmedicine.com)
  • In both cases, deviation from normal ion channel function leads to transmural dispersion of repolarization currents across the myocardium, triggering early after depolarizations which may devolve into TdP ( 1 ). (unboundmedicine.com)
  • The authors focus on action potential by indicating the five phases of the cardiac myocyte for changing the heart rate through depolarization and repolarization. (researchproposalwriting.com)
  • The three phases in pacemaker action include minor depolarization, rapid depolarization, and repolarization. (researchproposalwriting.com)
  • In patients undergoing cardiac catheterization, short-term exposure to air pollution was associated with increased HR and delays in atrioventricular conduction, ventricular depolarization and repolarization. (biomedcentral.com)
  • The depolarization and repolarization of the neuron's membrane is called an action potential (nerve impulse). (alanmacy.com)
  • A traveling nerve impulse is a propagating wave of depolarization and repolarization. (alanmacy.com)
  • The segment on an EKG tracing that represents the interval between the end of ventricular depolarization and the beginning of ventricular repolarization. (practicalclinicalskills.com)
Atria6
  • Contraction of the atria follows depolarization, represented by the P wave of the ECG. (wikipedia.org)
  • When the action potential triggers the muscles in the atria to contract (atrial systole), the pressure within the atria rises further, pumping blood into the ventricles. (foobrdigital.com)
  • In the systole phase, blood is forced to flow from the two atria into their respective ventricles as the atrial muscles contract due to the depolarization of the atria. (github.io)
  • Myocardial excitability is reduced in the atria, Purkinje fibers, papillary muscles, and ventricles by an increase in the threshold for excitation, combined with inhibition of ectopic pacemaker activity by retardation of the slow phase of diastolic depolarization, thus decreasing automaticity especially in ectopic sites. (nih.gov)
  • During systole, the heart`s chambers, the atria, and ventricles contract, pumping blood out of the heart into the circulatory system. (fm-siebdruck.de)
  • Atrial Fibrillation is a dysrhythmia while PAC is an early depolarization coming from the atria. (stackexchange.com)
Conduction3
  • Loss of normal electrical conduction in the heart-as seen during atrial fibrillation, atrial flutter, and complete heart block-may eliminate atrial systole completely. (wikipedia.org)
  • The electrocardiogram may reflect these effects by showing slight sinus tachycardia (due to the anticholinergic action) and widened QRS complexes and, less regularly, prolonged Q-T and P-R intervals (due to longer systole and slower conduction), as well as some decrease in QRS and T wave amplitude. (nih.gov)
  • You can have 1st degree block where the signal delay at the AV node is too long, 2nd degree where some P waves don't result in QRS complexes (ventricular systole doesn't always follow atrial systole), and 3rd degree where conduction is completely blocked. (khanacademy.org)
Aortic1
Ventricular contraction1
  • It may be conveniently divided into two phases, lasting a total of 270 ms. At the end of atrial systole and just prior to ventricular contraction, the ventricles contain approximately 130 mL blood in a resting adult in a standing position. (foobrdigital.com)
Occurs4
  • Mechanical contraction occurs after depolarisation, therefore systole starts at the end of the QRS complex and ends during the T wave. (visme.co)
  • Depolarization is a process that occurs in cardiac muscle cells, which triggers the muscle fibers to contract. (fm-siebdruck.de)
  • When depolarization occurs, it triggers the heart`s muscle fibers to contract, leading to the heart`s first phase of contraction, known as the systole. (fm-siebdruck.de)
  • The process of depolarization and contraction is a rhythmic process that occurs in response to the electrical signals generated by the heart`s pacemaker cells. (fm-siebdruck.de)
Atrioventricular valves1
  • During systole, the atrioventricular valves close, creating the first sound (the lub) of a heartbeat. (github.io)
Wave1
  • See where the pacemaker cells start the electrical wave of depolarization, and how it gets all the way to the ventricles of the heart. (khanacademy.org)
Cardiac muscle cells1
  • 11.Spontaneous depolarization can occur in all cardiac muscle cells but happens the quickest at the SA node, thus setting the pace for the entire heart since all cells are linked by the intercalated discs. (msudenver.edu)
Aorta2
  • During ventricular systole, pressure rises in the ventricles, pumping blood into the pulmonary trunk from the right ventricle and into the aorta from the left ventricle. (foobrdigital.com)
  • In the second phase of ventricular systole, the ventricular ejection phase , the contraction of the ventricular muscle has raised the pressure within the ventricle to the point that it is greater than the pressures in the pulmonary trunk and the aorta. (foobrdigital.com)
Sodium1
Isovolumetric1
  • Consequently, this initial phase of ventricular systole is known as isovolumic contraction , also called isovolumetric contraction (see Figure 19.27). (foobrdigital.com)
Heartbeat2
  • One complete heartbeat is made up of two phases: The first phase is called systole (SISS-tuh-lee). (github.io)
  • Depolarization is the first step in the cardiac cycle, which consists of a series of events that occur during each heartbeat. (fm-siebdruck.de)
Phase2
Calcium2
  • Elevated cytosolic calcium can provoke oscillatory depolarizations of the cardiac membrane and trigger sustained action potential generation and extra systoles. (medscape.com)
  • Increased intracellular concentrations of calcium have been suggested as a cause of depolarization of the cardiac membrane and, therefore, a trigger of sustained action potentials, extra systoles, and tachycardia (sinus, supraventricular, or ventricular). (medscape.com)
Phases1
Complex2
  • Ventricular systole (see Figure 19.27) follows the depolarization of the ventricles and is represented by the QRS complex in the ECG. (foobrdigital.com)
  • Man använder en EKG-apparat som kan presentera hjärtats signaler på olika sätt på datorskärm och genom pappersutskrift och The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). (netlify.app)
Blood3
  • Systole (/ˈsɪstəli/ SIST-ə-lee) is the part of the cardiac cycle during which some chambers of the heart contract after refilling with blood. (wikipedia.org)
  • The period of contraction that the heart undergoes while it pumps blood into circulation is called systole . (foobrdigital.com)
  • During systole, the ventricles contract and pump blood out of the heart. (proprofs.com)
Electrical2
  • Oberman and Bhardwaj believe that from the right atrium through the heart's ventricles, the electrical circuit determines the rate of depolarization and transmits the correct data for effective functioning. (researchproposalwriting.com)
  • 23.Detecting and recording the electrical depolarization of the heart muscle. (msudenver.edu)
Contract2
Pressure1
Left1
Correct answer1
Normal1
  • PQRST P-våg - förmaksdepolarisering QRS-komplex - ventrikulär Förstoring av en normal EKG-remsa som visar PQRST-intervall i en normal hjärtslag. (netlify.app)
Essential1
  • First, it`s essential to have a basic understanding of what depolarization is. (fm-siebdruck.de)