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	Nerve Impulses
		These impulses are due to events in the cell membrane, so to understand the nerve impulse we need to revise some properties of cell membranes.
		In nerve and muscle cells the membranes are electrically excitable, which means they can change their membrane potential, and this is the basis of the nerve impulse.
		The frequency of the impulse is related to the intensity of the stimulus.
	www.biologymad.com /NervousSystem/nerveimpulses.htm (2352 words)

	[No title]
		A nerve impulse or stimulus is transmitted along a nerve fiber by electric impulses.
		The nerve fiber connects either with another nerve fiber or with some other cell (such as a gland or cardiac, smooth, or skeletal muscle) capable of being stimulated by the nerve impulse (Fig.
		The role of acetylcholine in the brain is uncertain, as is indicated by the broken circles.
	www.uky.edu /~holler/neurotox.html (1416 words)

	* Nerve impulse - (Biology): Definition
		Nerve impulses are the means by which information is transmitted along the neuron and throughout the nervous system.
		A nerve impulse, or an action potential, is a series of electrical responses that occur in the cell.
		The release of neurotransmitter is triggered by the arrival of a nerve impulse (or action potential) and occurs through an unusually rapid process of cellular secretion: Within the pre-synaptic nerve terminal,...
	en.mimi.hu /biology/nerve_impulse.html (338 words)

	nerve cell
		Impulses are received by the cell body and passed, as a pulse of electric charge, along the axon.
		On reaching the synapse, the impulse releases a chemical neurotransmitter, which diffuses across to the neighbouring cell and there stimulates another impulse or the action of the effector cell.
		Nerve impulses travel quickly – in humans, they may reach speeds of 160 m/525 ft per second, although many are much slower.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0016171.html (443 words)

	Early American Manual Therapy
		The nerve cells of these centers are stimulated to increased activity by the presence of an excess of carbon dioxid in the blood, and their activity is decreased by an excess of oxygen in the blood, or, rather, in the lymph which immediately bathes the cells’ bodies.
		When a nerve impulse traverses a nerve trunk, there is produced in the fiber a change in its electrical condition—a wave of negativity which passes at the same rate and in the same direction as the wave of nerve impulse.
		Nerve impulses must be essentially alike, yet the manner of their transmission, and even more the nature of their effects in consciousness, differ very widely.
	www.meridianinstitute.com /eamt/files/burns2/bur2ch02.html (4995 words)

	Unit 3 - Nervous System
		Non-myelinated nerve fibers conduct the nerve impulse even more slowly, 100 cm / sec, than the slowest myelinated fibers, and some experiments suggest that there may be nerve fibers which conduct even more slowly, at about 5 to 10 cm / sec.
		In the case of voluntary muscle, the junction of nerve and muscle at which chemical transmission of the nerve impulse occurs is a rather specialized structure called the neuromuscular junction.
		Impulses from the vestibular nuclei of the medulla (Chapter 5) facilitate discharge of some motor neurons, which cause contraction of a group of motor units.
	www.nd.edu /~jsapirst/textbook/chapter_04.html (2749 words)

	Lesson 9 - The Nervous System - Page 5
		In this manner the nerve impulse is transferred to the second cell.
		Nerve pathways which use acetylcholine as a neurotransmitter are generally involved in memory, motivation and arousal.
		A chemical, such as serotonin, that is produced in the nerve cell and released across the synapse to transmit a signal to a neighboring nerve cell is referred to as a(n) __________.
	www.naturalhealthschool.com /9_5.html (393 words)

	purevolume™ \| Nerve Impulse
		Nerve Impulse is a rock band from the capitol of North Dakota, Bismarck.
		Nerve Impulse started in the summer of '98, when Dave Wisham and his brother Derek started playing together after buying a guitar and drum set.
		It took only two months for Nerve Impulse to put together a set list with Dave on guitar and singing lead, Derek on drums and singing, and Travis on bass.
	www.purevolume.com /nerveimpulse (515 words)

	Nervous System Answer Key
		Myelinated nerve fibres are surrounded by a sheath of myelin which acts an an insulator; the sheath is interrupted by nodes of Ranvier which are "jumping gaps" for the nerve impulse; both the myelin sheath and the nodes provide for faster transmission in myelinated nerve fibres than in unmyelinated fibres.
		This impulse is carried via a sensory nerve (.afferent nerve) through a dorsal root ganglion and the dorsal horn of a spinal nerve into the grey matter of the nerve cord.
		The nerve impulse is propagated along a nerve fibre as a "wave of negativity" caused by sodium ions flowing rapidly into the axon as a result of the opening of sodium gates.
	www.angelfire.com /sc/mrcomeau/nervous1AK.html (1175 words)

	Nerve conduction velocity
		Nerve conduction velocity (NCV) is a test of the speed of conduction of impulses through a nerve.
		The nerve is stimulated, usually with surface electrodes, which are patch-like electrodes (similar to those used for ECG) placed on the skin over the nerve at various locations.
		NCV is related to the diameter of the nerve and the normal degree of myelination (the presence of a myelin sheath on the axon) of the nerve.
	www.adam.com /democontent/hie/ency/article/003927.htm (546 words)

	Nerve Cell
		Once the signal reaches the axon terminal bundle, it may be transmitted to a neighboring nerve cell with the action of a chemical neurotransmitter.
		A nerve cell is like a receiver, transmitter and transmission line with the task of passing a signal along from its dendrites to the axon terminal bundle.
		The stimulus triggers an action potential in the cell membrane of the nerve cell, and that action potential provides the stimulus for a neighboring segment of the cell membrane.
	hyperphysics.phy-astr.gsu.edu /hbase/biology/nervecell.html (552 words)

	ScienceDaily: Controlling Your (Nerve) Impulses: Ion Channel Interaction Sheds Light On Epilepsy, Other Neurological ...
		Nerve impulses begin after exciting inputs are received by the nerve cell -- either from the environment or from other nerve cells in the body.
		The efficient and speedy passage of nerve impulses along axons is aided by the presence of an insulating cover, known as myelin, which maintains the electrical activity along the entire length of the axon.
		The nerve impulse is able to skip across the unmyelinated regions of the axon at the nodes of Ranvier, with the help of sodium and potassium channels.
	www.sciencedaily.com /releases/2006/03/060309190352.htm (1120 words)

	Domino_model_of_a_nerve (Site not responding. Last check: )
		A nerve impulse will not be triggered until the nerve is excited beyond its firing threshold.
		The speed of propagation of a nerve impulse is independent of the size of the triggering signal.
		After a nerve impulse has propagated down the axon, there is a "refractory period" during which the nerve cannot fire again.
	isaac.exploratorium.edu /~pauld/summer_institute/summer_day15current/Domino_model_of_a_nerve/Domino_model_of_a_nerve.html (401 words)

	2. Nerve and Muscle Cells
		The fact that the impulse transfers across the synapse only in one direction, from the presynaptic terminal to the postsynaptic terminal, is due to the release of a chemical transmitter by the presynaptic cell.
		Conduction of a nerve impulse in a nerve axon.
		Experimentally determined conduction velocity of a nerve impulse in a mammalian myelinated axon as a function of the diameter.
	butler.cc.tut.fi /~malmivuo/bem/bembook/02/02.htm (3465 words)

	CH 11 Neuron-to-Neuron Transmission
		axodendritic - pertaining to a synaptic connection between the axon of a transmitting neuron and the dendrite(s) of a receiving neuron in a nerve impulse pathway.
		axosomatic - pertaining to a synaptic connection between the axon of a transmitting neuron and the cell body/soma of a receiving neuron in a nerve impulse pathway.
		axoaxonic - pertaining to a synaptic connection between the axon of a transmitting neuron and the axon of a receiving neuron in a nerve impulse pathway.
	www.apsu.edu /schillerj/Biology%202010/Unit%20Reviews/Unit%203%20Review/CH%2011%20Neuron-to-Neuron%20Transmission.htm (497 words)

	[No title]
		The nerve impulse moves as a wave of electrical negativity along the membrane of the neuron.
		The refractory period is inversely proportional to diameter of nerve fiber.
		In the body, an impulse is usually initiated by a receptor or by higher centers in the brain.
	courses.nnu.edu /bi362bf/NERVE03.doc (1485 words)

	Functions of Neurons
		For the nerve impulse to communicate information to another part of the body, it must be propagated (transmitted) along the neuron.
		A nerve impulse generated at any one point on the membrane excites (depolarizes) adjacent areas, opening of new sodium ion channels, inward movement of Na+, and development of new nerve impulses at successive points along the membrane.
		The initiation and conduction of a muscle potential are basically similar to a nerve action potential (nerve impulse), although the duration of a muscle action potential is considerably longer, while the velocity of conduction of a nerve action potential is about 18 times faster.
	library.thinkquest.org /28457/Functions2.shtml (695 words)

	Subluxation Issues: The "Curse of Chiropractic" According to R.W. Stephenson
		Another significant focus of straight chiropractic is the view that subluxations block mental impulses from being transmitted from the brain to tissue cell, which according to Stephenson, represents the curse of chiropractic.
		It denotes that the source of the information carried within a nerve impulse is the innate intelligence of life existing in, and acting from, the 'mental realm' or immaterial plane of reality.
		Stephenson stated long ago that mental impulses are not blocked or interfered with by spinal subluxation; and advancing this erroneous notion is, in fact, the curse of chiropractic.
	www.chiroweb.com /archives/print_friendly.php?volume=24&issue=18&issue_date=September%201%2C%202006&pr_file_name=http%3A%2F%2Fwww.chiroweb.com%2Farchives%2F24%2F18%2F16.html (1027 words)

	Communication Between Nerve Cells
		A nerve impulse is the transmission of a coded signal from a given stimulus along the membrane of the neuron, starting in the point where it was applied.
		Nerve impulses can pass from one cell to another, thus creating a chain of information within a network of neurons.
		An impulse arriving in the presynaptic terminal causes the release of neurotransmitter.
	www.cerebromente.org.br /n12/fundamentos/neurotransmissores/neurotransmitters2.html (1953 words)

	Nobel Prize in Physiology or Medicine 1963 - Presentation Speech
		The impulse was found to deliver an amount of potential change which exceeded by one third that of the inside which is determined by a potassium concentration battery.
		His theory suggested that the nerve impulse involved an exchange between sodium ions from the outside and potassium ions from the inside of the fibre.
		The arriving impulse produces excitation or inhibition in the motor cell, because the terminals of the nerve fibre are connected to excitatory or inhibitory chemical mechanisms at the cell membrane.
	nobelprize.org /nobel_prizes/medicine/laureates/1963/press.html (1151 words)

	NID - Nerve Impulse Deficiency
		The job of this vast network of "living wires" is to carry electrical signals, composed of electrical nerve impulses, to and from all parts of your body.
		Peripheral nerves (motor nerves) have the job of carrying processed information, in the form of electrical control signals, from your brain and spinal cord to all the muscles, tissues and organs of your body.
		Nerve Impulse Deficiency occurs when your body's nervous system, for whatever reason, holds on to an altered firing pattern, repeats it automatically and fails to correct the situation on its own.
	www.askdrron.com /NID_-_Nerve_Impulse_Deficie.html (1027 words)

	Exploratorium Human Body Explorations: The Domino Effect
		The nerve impulse is propagated along the length of the nerve cell.
		Once the pulse of falling dominoes begins to propagate, it moves at a constant speed independent of the size of the starting push; analogously, the speed of the propagation of a nerve impulse is independent of the size of the triggering signal.
		The impulse travels to the neuron's axon, which passes the signal on to another neuron or to a target cell by releasing chemicals called neurotransmitters.
	www.exploratorium.org /ti/human_body/dominoeffect.html (1540 words)

	BSCI 60495 Nerve
		The nerve cell body (soma, perikaryon) is the region of the neuron surrounding the nucleus.
		When a nerve impulse reaches the end of the presynaptic axon it is directly transmitted to the postsynaptic membrane through the gap junctions.
		When a nerve impulse reaches the end of the presynaptic component (axon) the impulse initiates the release of the chemical transmitter into the synaptic cleft.
	dept.kent.edu /biology/courses/60495/nerve.htm (1782 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: )
		Planarian, a type of flatworm, have dual nerve cords running along the length of the body and merging at the tail.
		These nerve cords are connected by transverse nerves like the rungs of a ladder.
		Arthropods, such as insects and crustaceans, have a nervous system made up of a series of ganglia, connected by a ventral nerve cord made up of two parallel connectives running along the length of the belly [2].
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Nervous_system (961 words)

	pain - HighBeam Encyclopedia
		The stimulus is carried by nerve fibers to the spinal cord and then to the brain, where the nerve impulse is interpreted as pain.
		The excessive stimulation of nerve endings during pain is attributed to tissue damage, and in this sense pain has protective value, serving as a danger signal of disease and often facilitating diagnosis.
		Pain is occasionally felt not only at the site of stimulation but in other parts of the body supplied by nerves in the same sensory path; for example, the pain of angina pectoris or coronary thrombosis may extend to the left arm.
	www.encyclopedia.com /doc/1E1-pain.html (823 words)

	Nerve Impulse
		The bumps are nerve impulses traveling the length of the nerve.
		They are triggered by the electrical pulse which is sent to the nerve through the stimulating electrode.
		The electrical pulse and impulses are detected at the recording electrode.
	www.exploratorium.edu /cmp/exhibits/n/nerve_impulse.html (115 words)

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