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A signal transmitted along a nerve fibre. It consists of a wave of electrical depolarization that reverses the potential difference across the nerve cell membranes.
- ‘It is the influx of sodium into the cell that is responsible for generating an action potential, which causes depolarization and conduction of the nerve impulse.’
- ‘The arrival of the nerve impulse, an electrical signal, at the axon activates the influx of calcium ions through voltage-dependent ion channels in the membrane.’
- ‘This is achieved by the propagation of the chemotactic signal, in a manner rather similar to the conduction of a nerve impulse.’
- ‘First, there is a nerve impulse to the hypothalamus, an endocrine gland located near the brain.’
- ‘The nerve impulse, the chemical smell that traveled from the brain to command those muscles in your fingers would never get their without your spinal cord and a hundred other branching nerves.’
- ‘This separation triggers other mechanisms to send a nerve impulse to the brain.’
- ‘Its most important action is its ability to block the initiation or conduction of the nerve impulse following local application.’
- ‘As the brain senses a decrease in oxygen, a nerve impulse briefly rouses you from sleep.’
- ‘It literally is minimising its energy with the solvent in doing that and yet the effect is to make a wave, travelling impulse, sort of like a nerve impulse.’
- ‘‘Insect muscles differ from animal muscles in that they do not need a nerve impulse for every contraction but instead are activated by stretch,’ said Dr Irving.’
- ‘As a nerve impulse, or action potential, reaches the end of a presynaptic axon, molecules of neurotransmitter are released into the synaptic space.’
- ‘This ion flow triggers a cellular response, such as continuation of a nerve impulse to another neuron or the contraction of a muscle cell.’
- ‘After an action potential has swept along a single nerve fibre, a second nerve impulse cannot be initiated immediately.’
- ‘The whole process is under voluntary control, set in motion when a nerve impulse from the brain tells the muscle to tighten or relax.’
- ‘They have also made sure that our students who tend to know a lot about automobiles, may now comprehend very well how fast a nerve impulse may travel - in kilometres rather than in miles per hour.’
- ‘That was the real clue to the idea that it was specifically sodium conductivity which changed to cause the nerve impulse.’
- ‘These vibrations then stimulate the cilia, which transmit a nerve impulse to the brain informing the shark of the location of the source.’
- ‘When a hair is touched, receptors near the hair fire, triggering a nerve impulse that signals that the hair has been moved.’
- ‘MS occurs when parts of the covering of the brain and spinal cord are lost, which disrupts the conduction of the nerve impulse.’
- ‘Stimulation of any of these receptors results in the initiation of a nerve impulse that travels to the central nervous system.’
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