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impulse

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action potential

Overview page. Subjects: Medicine and Health — Science and Mathematics.

The change in voltage that occurs across the membrane of a nerve or muscle cell when a nerve impulse is triggered. It is due to the passage of charged particles across the membrane (see dep...

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angular impulse

Overview page. Subjects: Sports and Exercise Medicine.

A change in angular momentum of a system equal to the product of torque and the time interval during which the torque acts. See also impulse.

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coefficient of restitution

Overview page. Subjects: Sports and Exercise Medicine — Mathematics.

A parameter associated with the behaviour of two bodies during a collision. Suppose that two billiard balls are travelling in the same straight line and have velocities u 1 and unull...

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impulse-momentum relationship

Overview page. Subjects: Sports and Exercise Medicine.

An important relationship between impulse and momentum derived from Newton's second law, which shows that the impulse of force is equal to the change in momentum that it produces. It is...

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impulse-timing model

Overview page. Subjects: Sports and Exercise Medicine.

A model of the control of limb movement that suggests that motor programmes time the onset, duration, and amount of electrical activity delivered to a muscle, thereby controlling the...

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impulsion

Overview page. Subjects: Sports and Exercise Medicine.

A motion produced by an impulse.

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neuron

Overview page. Subjects: Science and Mathematics — Medicine and Health.

(neurone, nerve cell) n. one of the basic functional units of the nervous system: a cell specialized to transmit electrical nerve impulses and so carry information from one part of the body...

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O'Brien technique

Overview page. Subjects: Sports and Exercise Medicine.

Technique demonstrated in the 1952 Olympic Games by Parry O'Brien of the USA, for putting the shot. He moved across the circle to apply force to the shot for a longer period than was...

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propagation

Overview page. Subjects: Lifestyle, Home, and Garden.

1 (in botany) See vegetative propagation.

2 (in neurophysiology) The process whereby a nerve impulse travels along the axon of a neuron. Compare...

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transmission

Overview page. Subjects: Biological Sciences — Chemistry.

1 (in neurophysiology) The one-way transfer of a nerve impulse from one neuron to another across a synapse. See also neurotransmitter. Compare propagation.

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