gating mechanism

gat·ing mech·a·nism

1. occurrence of the maximum refractory period among cardiac conducting cells approximately 2-mm proximal to the terminal Purkinje fibers in the ventricular muscle, beyond which the refractory period is shortened through a sequence of Purkinje cells, transitional cells, and muscular cells; gating mechanism may be a cause of ventricular aberration, bidirectional tachycardia, and concealed extrasystoles;
2. a mechanism by which painful impulses may be blocked from entering the spinal cord. Compare: gate-control theory.

gating mechanism

1 the increasing duration of an action potential from the atrioventricular node to a point in the distal Purkinje system, beyond which it decreases.
2 a process that controls the opening and closing of cell-membrane ion channels.

gat·ing mech·an·ism

(gāt'ing mek'ă-nizm)
1. Occurrence of the maximum refractory period among cardiac conducting cells approximately 2 mm proximal to the terminal Purkinje fibers in the ventricular muscle; may be a cause of ventricular aberration, bidirectional tachycardia, and concealed extrasystoles.
2. A mechanism by which painful impulses may be blocked from entering the spinal cord.
Compare: gate-control theory
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References in periodicals archive ?
This seemingly confusing series of signal relays is actually part of a sophisticated gating mechanism, as evidenced by a short, 20-millisecond delay between when the LRIPs are initially activated, and when their inhibitory signals arrive in the hippocampus.
Comparing the open structure to that of the resting state structure (15) led to the proposed gating mechanism of the acetylcholine receptor.
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Owen Hamill will deal with the transduction and gating mechanisms of mechanosensitive channels in Xenopus oocytes.