What is precordial activity?
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Precordial activity refers to the movement of the chest wall when the heart beats.  When the heart beats it pushes against the rib cage and diaphragm in a certain way.  An experienced health care provider can often tell by palpating (touching) for the apex (pointed end) of the heart, whether there is enlargement, disease, damage, and to what extent.  Terms such as lifts, heaves, and thrills are used when notating location and duration of the movement.  An easy to understand example might be that the apex of the heart can be felt lower or more to the right in a patient with an enlarged heart, than one with a normal heart.  Precordial activity by itself isn't a term that means there is anything wrong.  All hearts have precordial activity.
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Neuronal activity is very complex, while influx of one molecule into the hilloc causes its depolarisation in one neuron it leads to hyperpolarisation in another.  With sufficient depolarisation and build up of Excitation K+ and Na+ activity beggins.  for every 2K+ brought into the cell 3Na+ are emitted from the cell.  This causes a cascade down the cell due to comple intracellular events of the depolarization being propagated down the axon.  This is electrical activity and so can be detected with electrodes.  There are many different types of proteins some of which are voltage sensitive along the length of the axon.  The local change in voltage activates these other channels leading to further depolarization and propogation moving along on.  This allows the depolarization to effectivley jump from one node of ranvier to the next (none insulated parts of neuron).  Talking of insulation, the mylin sheeth is made of schwan cells which promots signal propogation much like plastic covering copper.\n\nThe internal signals are very complex and would require a diagram, but involve Gproteins and Ca++.......
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its not a formula.  its not something that if you do certain thing, it will happen.  its a feel, a bond between two people that just happens.  Just be patient and open minded and you're day will come soon.  (and you should do your homework without the help of others!!!)
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glycolysis the step just before cellular respiration
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You can also check the PubMed website.  Type in "ryanodine" and "review" and you'll get over 600 hits.
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www.skillstat.com  you will click on ECG rhythms. very helpful.
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The EKG estimates the net vector (in two dimensions) of the electrical activity of the heart; from the direction that the V1 lead looks (Above and to the right of the heart, as I recall laying out the electrodes years ago), the electrical activity is going away from the lead--towards the feet, or in the QRS part (the really big deflection), it's going from the AV node toward the tip of the ventricles.  That would be read as a negative direction.\n\nRemember, at every instant in time, the EKG is recording the equivalent of the dot product between the actual vector of the flow of current (so to speak) in the heart, and a vector that is created by connecting the leads in question.  For the V1 lead (a precordial lead), the leads connected to the limbs are used as a single lead, sort of grounding things out between all four of them (think of it being a lead somewhere behind the belly button, if you want), and then measuring the dot product of the electrical vector and a line connecting the V1 position with that.\n\nA little vector algebra makes this a LOT easier!
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Rapidly, before it expolodes!
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http://en.wikipedia.org/wiki/Cardiovascular
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there are pre cal, cal, pre tri, tri, advance cal, and baisc math,  consumer's math, and statics probalility
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The PR interval represents the time from the onset of atrial depolarization to the onset of ventricular depolarization. It is a measured time on the surface ekg. A short PR interval may also occur as a normal variant, although it is much more common in the pediatric population and at faster heart rates. In itself it is not dangerous.
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possibly because it was triggered by an outside source...for example if you tried cocaine right before it happened then it was triggered by that.....but if youve had no other runs of it that long then it may not have been SVT either....just a case of ST...if it was a cardiac defect in the hearts electrical system I think you wouldve had more than just one episode....question is was this documented on an ekg???And did a cardiologist interpet it or just a regular dic???Alot can go into deciding if it was SVT or another arrythmia...
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Rise o heart beat or tackikardia
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seversdatter - As Mark_the_nurse has noted, the numbers you give are only a small part of the information that can be gleaned from an EKG.  More of the information can be determined by analyzing the pattern of waveforms on the EKG.  The numbers above are generated by the computer and represent the timing of certain events in the cardiac cycle.\n\n- The heart rate of 66bpm is normal.\n- The PR interval represents the time it takes for a signal to get from your sinoatrial node down to the ventricles.  It can be prolonged in patients with disease of the conduction system or shortened in patients with accessory pathways.  Yours is normal.\n- The QRS duration represents the amount of time it takes for an electrical signal to be distributed throughout the ventricles.  It can be prolonged in patients with disease of the conduction system or in patients with heart failure, for example.  Yours is normal.\n- The QT interval represents that amount of time it takes for the ventricles to repolarize after they have been activated by a normal electrical impulse.  People with prolonged QT intervals may be at risk for arrhythmias and cardiac arrest.  Your is normal.\n- The P, R, and T axes indicate the direction in which the electrical impulse is traveling.  Yours are all normal.\n\nIf you have questions about the EKG itself, it would be better for you to have a physician look at the whole study and review it with you.  It is possible for all these numbers to be within the normal range while the overall EKG is still abnormal.
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Hey Jennifer,\n\nHope the following article helps you to understand neurobiology on rhythm processing.\n\nhttp://www.informatik.uni-bremen.de/agki/www/ik2001/prog/av/paper.pdf \n\nCheers!!!
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the rotation of the earth and the semisic activity
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Joining new activities