Nerve conduction velocity?

1 Answer

Answer :

DefinitionNerve conduction velocity (NCV) is a test of the speed of electrical signals through a nerve.Alternative NamesNCVHow the test is performedPatches called surface electrodes, similar to those used for ECG, are placed on the skin over nerves at various locations. Each patch gives off a very mild electrical impulse, which stimulates the nerve.The nerve's resulting electrical activity is recorded by the other electrodes. The distance between electrodes and the time it takes for electrical impulses to travel between electrodes are used to determine the speed of the nerve signals.Electromyography(recording from needles placed into the muscles) is often done at the same time as this test.How to prepare for the testNormal body temperature must be maintained (low body temperature slows ner

Related questions

Description : The conduction velocity of the nerve fibres is increased by: a. decreased temperature b. increased concentration of the external sodium ions e. increased axon diameter d. myelination

Last Answer : myelination

Description : Do electrical nerve conduction studies hurt?

Last Answer : I have had them before, and no it does not hurt

Description : What is the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre? -Biology

Last Answer : answer:

Description : Depolarization of axolemma during nerve conduction takes place because of (a) equal amount of Na+ and K+ move out across axolemma (b) Na+ move inside and K+ move more outside (c) more Na+ outside (d) none of these.

Last Answer : (b) Na+ move inside and K+ move more outside

Description : Local anaesthetics block nerve conduction by: A. Blocking all cation channels in the neuronal membrane B. Hyperpolarizing the neuronal membrane C. Interfering with depolarization of the neuronal membrane D. Both ‘B’ and ‘C’ are correct

Last Answer : C. Interfering with depolarization of the neuronal membrane

Description : In a patient given a cardiac glycoside, important effects of the drug on the heart include which of the following? (a) Decreased atrioventricular conduction velocity (b) Decreased ejection time (c) Increased ectopic automaticity (d) Increased ectopic automaticity (e) All of the above

Last Answer : Ans: E

Description : With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible. (A) Increases (B) Decreases (C) Remain same

Last Answer : (A) Increases

Description : Which of the following has the slowest conduction velocity. a. alpha fibers b. beta fibers c. gamma fibers d. B fibers e. C fibers

Last Answer : C fibers

Description : A squid axon is placed on stimulating electrodes, and an intracellular electrode is inserted and connected through a cathode-ray oscilloscope (CRO) to an indifferent electrode. When the axon is stimulated, the latent ... . 40 m/s d. 67.5 m/s e. This cannot be determined from the information given

Last Answer : 30 m/s

Description : Calculate the electric field when the conductivity is 20 units, electron density is 2.4 units and the velocity is 10m/s. Assume the conduction and convection current densities are same. a) 2.4 b) 4.8 c) 3.6 d) 1.2

Last Answer : d) 1.2