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The electrical part of the heart is centered on the periodic contraction ( squeezing ) of the muscle cells that is caused by the cardiac pacemaker located in the sinoatrial node.
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electrical and part
Each part of the heart is susceptible to failure or dysfunction and the heart could be divided into the mechanical and the electrical.
Before it emerged as a unique discipline, control engineering was practiced as a part of mechanical engineering and control theory was studied as a part of electrical engineering, since electrical circuits can often be easily described using control theory techniques.
In many institutions electronic engineering is included as part of an electrical award, sometimes explicitly ( such as a of Engineering ( Electrical and Electronic ), in others electrical and electronic engineering are considered sufficiently broad and complex to be considered separately.
Electromagnetic units are part of a system of electrical units based primarily upon the magnetic properties of electric currents, the fundamental SI unit being the ampere.
* Ectopic beat occurs when electrical signals for a heartbeat originate in the wrong part of the myocardium
An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit ( e. g. a semiconductor, an electrolyte or a vacuum ).
Home electrical systems, for the most part, are wired with copper wire for its good conducting properties.
Historically, mainframes acquired their name in part because of their substantial size, and because of requirements for specialized heating, ventilation, and air conditioning ( HVAC ), and electrical power, essentially posing a " main framework " of dedicated infrastructure.
While initial research had been concerned mostly with the electrical characteristics of neurons, a particularly important part of the investigation in recent years has been the exploration of the role of neuromodulators such as dopamine, acetylcholine, and serotonin on behavior and learning.
The two components of the proton-motive force are thermodynamically equivalent: In mitochondria, the largest part of energy is provided by the potential ; in alkaliphile bacteria the electrical energy even has to compensate for a counteracting inverse pH difference.
The disparity between the electrical output of these two slightly different images is resolved either at the level of the lateral geniculate nucleus or in a part of the visual cortex called ' V1 '.
The C revision of the standard was issued in 1969 in part to accommodate the electrical characteristics of these devices.
Another view is that a device which is plugged into an electrical outlet of a wall becomes part of the building, but is nonfunctional while the switch is off ; turning it on would then constitute " building " and turning it off would be " demolishing " ( categories 35 and 34 ).
* BIBO stability ( Bounded Input, Bounded Output stability ), in signal processing and control theory, part of electrical engineering
Swan developed an incandescent light with a long lasting filament at about the same time as Edison, as Swan's earlier bulbs lacked the high resistance needed to be an effective part of an electrical utility.
In the late 1920s, the new quantum mechanics showed that the chemical bonds between atoms were examples of ( quantum ) electrical forces, justifying Dirac's boast that " the underlying physical laws necessary for the mathematical theory of a large part of physics and the whole of chemistry are thus completely known ".
The rapid industrialization in the 20th century made electrical transmission lines and grids a critical part of the infrastructure in most industrialized nations.
Equipment bonding conductors provide a low impedance path between non-current-carrying metallic parts of equipment and one of the conductors of that electrical system's source, so that if a part becomes energized for any reason, such as a frayed or damaged conductor, a short circuit will occur and operate a circuit breaker or fuse to disconnect the faulted circuit.
However, in digital and radio frequency PCBs, the major reason for using large ground planes is to reduce electrical noise and interference being coupled from one part of the circuit to another through the ground ( ground loops ), and crosstalk between adjacent circuit traces.
At one time, messages prepared for electrical transmission were composed on a printed blank form with spaces for each part of the message and for administrative entries.
electrical and heart
* Cardiac electrophysiology: Study of the electrical properties and conduction diseases of the heart.
The action potentials generated in the pacemaker propagate throughout the heart in a specific pattern and is the system that carries this potential is called the electrical conduction system.
Dysfunction of the electrical system manifests in many ways and includes Wolff – Parkinson – White syndrome, ventricular fibrillation, and heart block.
; Asystole (" flatline "): Asystole refers to the absence of electrical activity of the heart and is sometimes referred to as a " flatline " because the electrocardiogram shows a solid line due to the absence of electrical activity.
; Electrocardiography ( ECG or EKG ): Measurement of the electrical activity of the heart, typically with 4 or 10 electrodes on the skin.
; Electrophysiology study: Studying the electrical activity of the heart through the use of catheters placed in the heart via veins or arteries.
Cardiac causes include acute or chronic ischemic heart disease, vascular heart disease, valvular heart disease, or degenerative primary electrical disease.
* Vagus nerve stimulation ( US manufacturer Cyberonics ) consists of a computerized electrical device similar in size, shape and implant location to a heart pacemaker that connects to the vagus nerve in the neck.
It does not moderate the effect of pain on heart rate and a recent single study found that sugar did not significantly affect pain-related electrical activity in the brains of newborns one second after the heel lance procedure.
The impulses generated during the heart cycle produce electrical currents, which are conducted through body fluids to the skin, where they can be detected by electrodes and recorded as an electrocardiogram ( ECG or EKG ).
The second heart slowed down without an electrical stimulation.
Sensitive galvanometers were used to detect signals from long submarine cables, and were used to discover the electrical activity of the heart and brain.
The string galvanometer was a type of mirror galvanometer so sensitive that it was used to make the first electrocardiogram of the electrical activity of the human heart.
The other type of striated muscle, cardiac or heart muscle, cannot be tetanized because of its intrinsic electrical properties.
Death was frequently caused by electrical overstimulation of the heart.
Electrocardiography ( ECG or EKG from the German Elektrokardiogramm ) is a transthoracic ( across the thorax or chest ) interpretation of the electrical activity of the heart over a period of time, as detected by electrodes attached to the outer surface of the skin and recorded by a device external to the body.
An ECG test records the electrical activity of the heart.
An ECG is the best way to measure and diagnose abnormal rhythms of the heart, particularly abnormal rhythms caused by damage to the conductive tissue that carries electrical signals, or abnormal rhythms caused by electrolyte imbalances.
electrical and is
It is good to know that Georgia will continue to have sufficient electrical power not only to meet the demands of normal growth but to encourage a more rapid rate of industrialization.
This is used as a reference for comparing the ohmic heating and the electrical energy obtained from the measured current through the element and the measured voltage across the element.
He is a member of the Institution of Electrical Engineers, London, a registered professional engineer in Connecticut and Ohio, and a chartered electrical engineer in Great Britain.
Chapter 8, is entitled `` On Magnetism '' and in it are included such remarks as, `` One has always been tempted to compare the magnetic forces with the electrical forces.
The form of galvanic activity is halfway between the magnetic form and the electrical form.
Since electrical stimulation of the posterior hypothalamus produces the effects of wakefulness while stimulation of the anterior hypothalamus induces sleep, it may be said that the reactivity of the whole organism is altered by a change in the autonomic reactivity of the hypothalamus.
It is assumed that the gyros are designed with electrical torquers so that a torque can be applied about their output axes.
The electrical signal from the autocollimator is amplified and supplied to the Z-gyro torquer.
It is possible to locate an angular electrical pickoff, which will indicate the angular deviation between the true heading direction and the platform.
Essentially, the stator or reference portion of the pickoff is established with respect to the true heading direction, and the platform is turned either manually or automatically until the angular electrical pickoff signal is reduced to zero.
The recent publicity attending the successful federal prosecution of a conspiracy indictment against a number of electrical manufacturers has evoked a new respect for the anti-trust laws that is justified neither by their rationale nor by the results they have obtained.
The problem becomes even more complex where an enterprise is engaged in the manufacture of a wide variety of other goods in addition to the heavy electrical equipment.
The electron is by far the least massive of these particles at, with a negative electrical charge and a size that is too small to be measured using available techniques.
An axon ( also known as a nerve fiber ) is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body.
Structural, mechanical, and electrical engineers and other specialists, are hired by the client or the architect, who must ensure that the work is co-ordinated to construct the design.
RWTH Aachen University, established as Polytechnicum in 1870, is one of the Germany's Universities of Excellence with strong emphasis on technological research, especially for electrical and mechanical engineering, computer sciences, physics, and chemistry.
The ' far-away light ' () is a reference to St Elmo's Fire, an electrical discharge supposed by ancient Greek mariners to be an epiphany of the Dioscuri, but the meaning of the line was obscured by gaps in the papyrus until reconstructed by a modern scholar — such reconstructions are typical of the extant poetry ( see Scholars, fragments and sources below ).
Thus, an analog signal is one represented by a continuous stream of data, in this case along an electrical circuit in the form of voltage, current or charge changes ( compare with digital signals below ).
An anode is an electrode through which electric current flows into a polarized electrical device.
An analog computer is a form of computer that uses the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved.
Audio is an electrical or other representation of sound.
In either case the primer is usually percussion but electrical is also used and laser ignition is emerging.
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